{"id":15026,"date":"2026-10-09T08:31:46","date_gmt":"2026-10-09T08:31:46","guid":{"rendered":"https:\/\/weldomachining.com\/?page_id=15026"},"modified":"2026-10-15T03:06:11","modified_gmt":"2026-10-15T03:06:11","slug":"black-oxide-coating","status":"publish","type":"page","link":"https:\/\/weldomachining.com\/fr\/black-oxide-coating\/","title":{"rendered":"Rev\u00eatement d'oxyde noir"},"content":{"rendered":"<div data-elementor-type=\"wp-page\" data-elementor-id=\"15026\" class=\"elementor elementor-15026\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9a32685 e-con-full e-flex e-con e-parent\" data-id=\"9a32685\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-19bdcc7 elementor-widget elementor-widget-html\" data-id=\"19bdcc7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section class=\"bo-section\" style=\"padding-top:44px;background:linear-gradient(135deg,#fff 0%,#fff 62%,#eef7fa 100%)\"><div class=\"bo-wrap bo-split bo-hero-layout\"><div class=\"bo-hero-copy\"><p class=\"bo-eyebrow\">Precision surface finishing<\/p><h1 class=\"bo-title\">Black Oxide Coating Services for CNC Parts<\/h1><p class=\"bo-lead\">Weldo provides controlled black oxide coating for CNC-machined steel, stainless steel and other compatible metal parts.<\/p><div class=\"bo-grid bo-grid--2 bo-hero-points\" style=\"margin:25px 0\"><div class=\"bo-card\"><h3>Minimal buildup<\/h3><p>Supports close fits and functional threads.<\/p><\/div><div class=\"bo-card\"><h3>Sealer choices<\/h3><p>Oil, wax or dry-to-touch options.<\/p><\/div><div class=\"bo-card\"><h3>Controlled process<\/h3><p>Hot and stainless-grade routes.<\/p><\/div><div class=\"bo-card\"><h3>Final inspection<\/h3><p>Appearance and critical dimensions checked.<\/p><\/div><\/div><a class=\"bo-btn\" href=\"https:\/\/weldomachining.com\/fr\/telechargement-de-fichiers\/\">Upload Drawing for Quote<\/a><\/div><figure class=\"bo-media bo-hero-media\"><img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/10\/Black-oxide-parts-in-multiple-ferrous-materials.webp\" alt=\"Black oxide coated CNC metal parts\" width=\"700\" height=\"700\"><\/figure><\/div><\/section>\n<style>\n.bo-section{--bo-blue:#30328e;--bo-navy:#22266c;--bo-ink:#243b46;--bo-muted:#607681;--bo-line:#dce8ed;--bo-pale:#f3f8fb;--bo-cyan:#51acc8;box-sizing:border-box;width:100%;padding:72px 0;font-family:Inter,Arial,sans-serif;color:var(--bo-ink);line-height:1.62}.bo-section *{box-sizing:border-box}.bo-section img{display:block;max-width:100%;height:auto}.bo-section a{color:var(--bo-blue)}.bo-section a:hover{color:var(--bo-navy)}.bo-wrap{width:min(1160px,calc(100% - 40px));margin:0 auto}.bo-eyebrow{margin:0 0 10px;color:var(--bo-blue);font-size:12px;font-weight:800;letter-spacing:.1em;text-transform:uppercase}.bo-title{margin:0 0 14px;color:var(--bo-navy);font-size:clamp(28px,3vw,38px);line-height:1.16}.bo-lead{max-width:780px;margin:0;color:#536a75;font-size:16px}.bo-grid{display:grid;gap:18px}.bo-grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}.bo-grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}.bo-grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}.bo-card{height:100%;padding:22px;border:1px solid var(--bo-line);border-radius:16px;background:#fff;box-shadow:0 7px 20px rgba(37,59,70,.04)}.bo-card h3{margin:0 0 8px;color:var(--bo-navy);font-size:18px;line-height:1.25}.bo-card p{margin:0;color:var(--bo-muted);font-size:14px}.bo-btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 22px;border-radius:9px;background:var(--bo-blue);color:#fff!important;text-decoration:none;font-weight:700}.bo-btn:hover,.bo-btn:focus{background:var(--bo-navy);color:#fff!important}.bo-table-wrap{overflow:hidden;border:1px solid var(--bo-line);border-radius:15px;background:#fff}.bo-table{width:100%;border-collapse:collapse;text-align:left;font-size:14px}.bo-table th,.bo-table td{padding:15px 16px;border-bottom:1px solid var(--bo-line);vertical-align:top}.bo-table th{background:var(--bo-navy);color:#fff;font-size:13px}.bo-table td:first-child{color:var(--bo-navy);font-weight:700}.bo-table tr:last-child td{border-bottom:0}.bo-note{margin-top:17px;padding:14px 17px;border-left:4px solid var(--bo-cyan);border-radius:0 9px 9px 0;background:#eef7fa;color:#536a75;font-size:14px}.bo-media{display:flex;align-items:center;justify-content:center;padding:14px;border:1px solid var(--bo-line);border-radius:20px;background:#fff;box-shadow:0 12px 30px rgba(37,59,70,.08)}.bo-media img{width:100%;max-height:470px;object-fit:contain;border-radius:12px}.bo-split{display:grid;grid-template-columns:1fr 1fr;gap:42px;align-items:center}.bo-steps{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px}.bo-step{padding:18px 14px;border:1px solid var(--bo-line);border-radius:14px;background:#fff}.bo-step b{display:block;margin-bottom:7px;color:var(--bo-navy);font-size:15px}.bo-step span{color:var(--bo-muted);font-size:13px}.bo-faq{display:grid;gap:11px}.bo-faq details{border:1px solid var(--bo-line);border-radius:13px;background:#fff;overflow:hidden}.bo-faq summary{padding:17px 48px 17px 18px;color:var(--bo-navy);font-weight:700;cursor:pointer}.bo-faq .bo-answer{padding:0 18px 17px;color:var(--bo-muted);font-size:14px}.bo-faq .bo-answer p{margin:0}.bo-cta{display:flex;align-items:center;justify-content:space-between;gap:25px;padding:30px;border-radius:18px;background:linear-gradient(135deg,#f5f9ff,#eef7fa)}\n@media(max-width:900px){.bo-grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}.bo-steps{grid-template-columns:repeat(3,minmax(0,1fr))}.bo-split{grid-template-columns:1fr;gap:25px}}\n@media(max-width:640px){.bo-wrap{width:calc(100% - 28px)}.bo-section{padding:50px 0}.bo-grid--2,.bo-grid--3,.bo-grid--4,.bo-steps{grid-template-columns:1fr}.bo-title{font-size:27px}.bo-lead{font-size:15px}.bo-cta{display:block;padding:23px}.bo-cta .bo-btn{width:100%;margin-top:18px}.bo-table-wrap{border:0;background:transparent;overflow:visible}.bo-table,.bo-table thead,.bo-table tbody,.bo-table tr,.bo-table th,.bo-table td{display:block;width:100%}.bo-table thead{display:none}.bo-table tbody{display:grid;gap:11px}.bo-table tr{padding:3px 15px;border:1px solid var(--bo-line);border-radius:13px;background:#fff}.bo-table td{display:grid;grid-template-columns:39% 1fr;gap:10px;padding:11px 0;font-size:13px}.bo-table td::before{content:attr(data-label);color:var(--bo-muted);font-size:12px;font-weight:700}.bo-table td:first-child{color:var(--bo-navy)}.bo-table td:last-child{border-bottom:0}}\n<\/style>\n<style>\n.bo-hero-layout{grid-template-columns:minmax(0,1.15fr) minmax(300px,.85fr);gap:54px}\n.bo-hero-copy{max-width:650px}\n.bo-hero-points{gap:12px}\n.bo-hero-points .bo-card{padding:17px 18px}\n.bo-hero-points .bo-card p{font-size:13px}\n.bo-hero-media{width:min(100%,470px);justify-self:end;padding:10px;border-radius:18px}\n.bo-hero-media img{max-height:430px}\n@media(max-width:900px){.bo-hero-layout{grid-template-columns:1fr;gap:28px}.bo-hero-copy{max-width:none}.bo-hero-media{justify-self:center;width:min(100%,430px)}}\n@media(max-width:640px){.bo-hero-points{grid-template-columns:1fr}.bo-hero-media{width:min(100%,340px)}.bo-hero-copy .bo-btn{width:100%}}\n<\/style>\n<style>\n.bo-section .bo-title{font-size:32px!important;line-height:1.2}\n.bo-section h1.bo-title{font-size:35px!important}\n.bo-section .bo-lead{font-size:16px;line-height:1.55}\n.bo-section .bo-card h3{font-size:17px}\n@media(max-width:640px){.bo-section .bo-title,.bo-section h1.bo-title{font-size:26px!important}.bo-section .bo-lead{font-size:15px}.bo-section .bo-card h3{font-size:16px}}\n<\/style>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fb14ce1 elementor-widget elementor-widget-html\" data-id=\"fb14ce1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section class=\"bo-section\" id=\"bo-process\"><div class=\"bo-wrap\"><p class=\"bo-eyebrow\">Process selection<\/p><h2 class=\"bo-title\">Which Black Oxide Process Is Right?<\/h2><p class=\"bo-lead\">We select the process according to material grade, heat-treatment condition and drawing specification.<\/p><div class=\"bo-grid bo-grid--4\" style=\"margin-top:25px\"><article class=\"bo-card\"><h3>Hot Black Oxide<\/h3><p>About 135\u2013150\u00b0C for steel, tool steel and compatible cast iron.<\/p><\/article><article class=\"bo-card\"><h3>Mid-Temperature<\/h3><p>About 90\u2013120\u00b0C for approved industrial applications.<\/p><\/article><article class=\"bo-card\"><h3>Acier inoxydable<\/h3><p>Dedicated chemistry matched to the stainless grade.<\/p><\/article><article class=\"bo-card\"><h3>Room-Temperature<\/h3><p>Used for approved local color restoration and touch-up.<\/p><\/article><\/div><div class=\"bo-note\">For process background and maintenance guidance, see our <a href=\"https:\/\/weldomachining.com\/fr\/black-oxide\/\">Black Oxide Guide<\/a>.<\/div><div style=\"height:48px\"><\/div><p class=\"bo-eyebrow\">Controlled workflow<\/p><h2 class=\"bo-title\">How Is Black Oxide Applied?<\/h2><p class=\"bo-lead\">Five controlled stages connect drawing requirements with a consistent finished part.<\/p><div class=\"bo-steps\" style=\"margin-top:23px\"><div class=\"bo-step\"><b>01 \u00b7 Review<\/b><span>Verify material, hardness, drawing and masking.<\/span><\/div><div class=\"bo-step\"><b>02 \u00b7 Clean<\/b><span>Remove oil, rust and heat-treatment scale.<\/span><\/div><div class=\"bo-step\"><b>03 \u00b7 Blacken<\/b><span>Control chemistry, temperature and time.<\/span><\/div><div class=\"bo-step\"><b>04 \u00b7 Seal<\/b><span>Rinse and apply oil, wax or dry film.<\/span><\/div><div class=\"bo-step\"><b>05 \u00b7 Inspect<\/b><span>Check appearance, dimensions and packaging.<\/span><\/div><\/div><\/div><\/section>\n<style>\n.bo-section{--bo-blue:#30328e;--bo-navy:#22266c;--bo-ink:#243b46;--bo-muted:#607681;--bo-line:#dce8ed;--bo-pale:#f3f8fb;--bo-cyan:#51acc8;box-sizing:border-box;width:100%;padding:72px 0;font-family:Inter,Arial,sans-serif;color:var(--bo-ink);line-height:1.62}.bo-section *{box-sizing:border-box}.bo-section img{display:block;max-width:100%;height:auto}.bo-section a{color:var(--bo-blue)}.bo-section a:hover{color:var(--bo-navy)}.bo-wrap{width:min(1160px,calc(100% - 40px));margin:0 auto}.bo-eyebrow{margin:0 0 10px;color:var(--bo-blue);font-size:12px;font-weight:800;letter-spacing:.1em;text-transform:uppercase}.bo-title{margin:0 0 14px;color:var(--bo-navy);font-size:clamp(28px,3vw,38px);line-height:1.16}.bo-lead{max-width:780px;margin:0;color:#536a75;font-size:16px}.bo-grid{display:grid;gap:18px}.bo-grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}.bo-grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}.bo-grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}.bo-card{height:100%;padding:22px;border:1px solid var(--bo-line);border-radius:16px;background:#fff;box-shadow:0 7px 20px rgba(37,59,70,.04)}.bo-card h3{margin:0 0 8px;color:var(--bo-navy);font-size:18px;line-height:1.25}.bo-card p{margin:0;color:var(--bo-muted);font-size:14px}.bo-btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 22px;border-radius:9px;background:var(--bo-blue);color:#fff!important;text-decoration:none;font-weight:700}.bo-btn:hover,.bo-btn:focus{background:var(--bo-navy);color:#fff!important}.bo-table-wrap{overflow:hidden;border:1px solid var(--bo-line);border-radius:15px;background:#fff}.bo-table{width:100%;border-collapse:collapse;text-align:left;font-size:14px}.bo-table th,.bo-table td{padding:15px 16px;border-bottom:1px solid var(--bo-line);vertical-align:top}.bo-table th{background:var(--bo-navy);color:#fff;font-size:13px}.bo-table td:first-child{color:var(--bo-navy);font-weight:700}.bo-table tr:last-child td{border-bottom:0}.bo-note{margin-top:17px;padding:14px 17px;border-left:4px solid var(--bo-cyan);border-radius:0 9px 9px 0;background:#eef7fa;color:#536a75;font-size:14px}.bo-media{display:flex;align-items:center;justify-content:center;padding:14px;border:1px solid var(--bo-line);border-radius:20px;background:#fff;box-shadow:0 12px 30px rgba(37,59,70,.08)}.bo-media img{width:100%;max-height:470px;object-fit:contain;border-radius:12px}.bo-split{display:grid;grid-template-columns:1fr 1fr;gap:42px;align-items:center}.bo-steps{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px}.bo-step{padding:18px 14px;border:1px solid var(--bo-line);border-radius:14px;background:#fff}.bo-step b{display:block;margin-bottom:7px;color:var(--bo-navy);font-size:15px}.bo-step span{color:var(--bo-muted);font-size:13px}.bo-faq{display:grid;gap:11px}.bo-faq details{border:1px solid var(--bo-line);border-radius:13px;background:#fff;overflow:hidden}.bo-faq summary{padding:17px 48px 17px 18px;color:var(--bo-navy);font-weight:700;cursor:pointer}.bo-faq .bo-answer{padding:0 18px 17px;color:var(--bo-muted);font-size:14px}.bo-faq .bo-answer p{margin:0}.bo-cta{display:flex;align-items:center;justify-content:space-between;gap:25px;padding:30px;border-radius:18px;background:linear-gradient(135deg,#f5f9ff,#eef7fa)}\n@media(max-width:900px){.bo-grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}.bo-steps{grid-template-columns:repeat(3,minmax(0,1fr))}.bo-split{grid-template-columns:1fr;gap:25px}}\n@media(max-width:640px){.bo-wrap{width:calc(100% - 28px)}.bo-section{padding:50px 0}.bo-grid--2,.bo-grid--3,.bo-grid--4,.bo-steps{grid-template-columns:1fr}.bo-title{font-size:27px}.bo-lead{font-size:15px}.bo-cta{display:block;padding:23px}.bo-cta .bo-btn{width:100%;margin-top:18px}.bo-table-wrap{border:0;background:transparent;overflow:visible}.bo-table,.bo-table thead,.bo-table tbody,.bo-table tr,.bo-table th,.bo-table td{display:block;width:100%}.bo-table thead{display:none}.bo-table tbody{display:grid;gap:11px}.bo-table tr{padding:3px 15px;border:1px solid var(--bo-line);border-radius:13px;background:#fff}.bo-table td{display:grid;grid-template-columns:39% 1fr;gap:10px;padding:11px 0;font-size:13px}.bo-table td::before{content:attr(data-label);color:var(--bo-muted);font-size:12px;font-weight:700}.bo-table td:first-child{color:var(--bo-navy)}.bo-table td:last-child{border-bottom:0}}\n<\/style>\n<style>\n.bo-section .bo-title{font-size:32px!important;line-height:1.2}\n.bo-section h1.bo-title{font-size:35px!important}\n.bo-section .bo-lead{font-size:16px;line-height:1.55}\n.bo-section .bo-card h3{font-size:17px}\n@media(max-width:640px){.bo-section .bo-title,.bo-section h1.bo-title{font-size:26px!important}.bo-section .bo-lead{font-size:15px}.bo-section .bo-card h3{font-size:16px}}\n<\/style>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5cd663a elementor-widget elementor-widget-html\" data-id=\"5cd663a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section class=\"bo-section\" style=\"background:var(--bo-pale)\" id=\"bo-materials\"><div class=\"bo-wrap\"><p class=\"bo-eyebrow\">Suitable materials<\/p><h2 class=\"bo-title\">Black Oxide Compatible Materials<\/h2><p class=\"bo-lead\">The material grade and surface condition determine the process, masking and sealing route.<\/p><div class=\"bo-split\" style=\"margin-top:26px\"><div class=\"bo-grid bo-grid--2\"><article class=\"bo-card\"><h3>Acier au carbone<\/h3><p>Pins, sleeves, brackets and screws.<\/p><\/article><article class=\"bo-card\"><h3>Acier alli\u00e9<\/h3><p>Gears, shafts, bushings and high-strength fasteners.<\/p><\/article><article class=\"bo-card\"><h3>Acier \u00e0 outils<\/h3><p>Punches, dies and tool holders.<\/p><\/article><article class=\"bo-card\"><h3>Fonte<\/h3><p>Gears, pulleys and housings.<\/p><\/article><article class=\"bo-card\"><h3>Acier inoxydable<\/h3><p>Instrument parts, optical hardware and fasteners.<\/p><\/article><article class=\"bo-card\"><h3>Powder-Metal Parts<\/h3><p>Sintered gears, sprockets and bushings.<\/p><\/article><\/div><figure class=\"bo-media\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/10\/Black-oxide-parts-in-multiple-ferrous-materials.webp\" alt=\"Black oxide parts in multiple ferrous materials\" width=\"700\" height=\"700\"><\/figure><\/div><p class=\"bo-note\">Aluminum normally uses black anodizing. Copper and brass require dedicated chemical blackening and should be specified separately.<\/p><\/div><\/section>\n<style>\n.bo-section{--bo-blue:#30328e;--bo-navy:#22266c;--bo-ink:#243b46;--bo-muted:#607681;--bo-line:#dce8ed;--bo-pale:#f3f8fb;--bo-cyan:#51acc8;box-sizing:border-box;width:100%;padding:72px 0;font-family:Inter,Arial,sans-serif;color:var(--bo-ink);line-height:1.62}.bo-section *{box-sizing:border-box}.bo-section img{display:block;max-width:100%;height:auto}.bo-section a{color:var(--bo-blue)}.bo-section a:hover{color:var(--bo-navy)}.bo-wrap{width:min(1160px,calc(100% - 40px));margin:0 auto}.bo-eyebrow{margin:0 0 10px;color:var(--bo-blue);font-size:12px;font-weight:800;letter-spacing:.1em;text-transform:uppercase}.bo-title{margin:0 0 14px;color:var(--bo-navy);font-size:clamp(28px,3vw,38px);line-height:1.16}.bo-lead{max-width:780px;margin:0;color:#536a75;font-size:16px}.bo-grid{display:grid;gap:18px}.bo-grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}.bo-grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}.bo-grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}.bo-card{height:100%;padding:22px;border:1px solid var(--bo-line);border-radius:16px;background:#fff;box-shadow:0 7px 20px rgba(37,59,70,.04)}.bo-card h3{margin:0 0 8px;color:var(--bo-navy);font-size:18px;line-height:1.25}.bo-card p{margin:0;color:var(--bo-muted);font-size:14px}.bo-btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 22px;border-radius:9px;background:var(--bo-blue);color:#fff!important;text-decoration:none;font-weight:700}.bo-btn:hover,.bo-btn:focus{background:var(--bo-navy);color:#fff!important}.bo-table-wrap{overflow:hidden;border:1px solid var(--bo-line);border-radius:15px;background:#fff}.bo-table{width:100%;border-collapse:collapse;text-align:left;font-size:14px}.bo-table th,.bo-table td{padding:15px 16px;border-bottom:1px solid var(--bo-line);vertical-align:top}.bo-table th{background:var(--bo-navy);color:#fff;font-size:13px}.bo-table td:first-child{color:var(--bo-navy);font-weight:700}.bo-table tr:last-child td{border-bottom:0}.bo-note{margin-top:17px;padding:14px 17px;border-left:4px solid var(--bo-cyan);border-radius:0 9px 9px 0;background:#eef7fa;color:#536a75;font-size:14px}.bo-media{display:flex;align-items:center;justify-content:center;padding:14px;border:1px solid var(--bo-line);border-radius:20px;background:#fff;box-shadow:0 12px 30px rgba(37,59,70,.08)}.bo-media img{width:100%;max-height:470px;object-fit:contain;border-radius:12px}.bo-split{display:grid;grid-template-columns:1fr 1fr;gap:42px;align-items:center}.bo-steps{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px}.bo-step{padding:18px 14px;border:1px solid var(--bo-line);border-radius:14px;background:#fff}.bo-step b{display:block;margin-bottom:7px;color:var(--bo-navy);font-size:15px}.bo-step span{color:var(--bo-muted);font-size:13px}.bo-faq{display:grid;gap:11px}.bo-faq details{border:1px solid var(--bo-line);border-radius:13px;background:#fff;overflow:hidden}.bo-faq summary{padding:17px 48px 17px 18px;color:var(--bo-navy);font-weight:700;cursor:pointer}.bo-faq .bo-answer{padding:0 18px 17px;color:var(--bo-muted);font-size:14px}.bo-faq .bo-answer p{margin:0}.bo-cta{display:flex;align-items:center;justify-content:space-between;gap:25px;padding:30px;border-radius:18px;background:linear-gradient(135deg,#f5f9ff,#eef7fa)}\n@media(max-width:900px){.bo-grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}.bo-steps{grid-template-columns:repeat(3,minmax(0,1fr))}.bo-split{grid-template-columns:1fr;gap:25px}}\n@media(max-width:640px){.bo-wrap{width:calc(100% - 28px)}.bo-section{padding:50px 0}.bo-grid--2,.bo-grid--3,.bo-grid--4,.bo-steps{grid-template-columns:1fr}.bo-title{font-size:27px}.bo-lead{font-size:15px}.bo-cta{display:block;padding:23px}.bo-cta .bo-btn{width:100%;margin-top:18px}.bo-table-wrap{border:0;background:transparent;overflow:visible}.bo-table,.bo-table thead,.bo-table tbody,.bo-table tr,.bo-table th,.bo-table td{display:block;width:100%}.bo-table thead{display:none}.bo-table tbody{display:grid;gap:11px}.bo-table tr{padding:3px 15px;border:1px solid var(--bo-line);border-radius:13px;background:#fff}.bo-table td{display:grid;grid-template-columns:39% 1fr;gap:10px;padding:11px 0;font-size:13px}.bo-table td::before{content:attr(data-label);color:var(--bo-muted);font-size:12px;font-weight:700}.bo-table td:first-child{color:var(--bo-navy)}.bo-table td:last-child{border-bottom:0}}\n<\/style>\n<style>\n.bo-section .bo-title{font-size:32px!important;line-height:1.2}\n.bo-section h1.bo-title{font-size:35px!important}\n.bo-section .bo-lead{font-size:16px;line-height:1.55}\n.bo-section .bo-card h3{font-size:17px}\n@media(max-width:640px){.bo-section .bo-title,.bo-section h1.bo-title{font-size:26px!important}.bo-section .bo-lead{font-size:15px}.bo-section .bo-card h3{font-size:16px}}\n<\/style>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7ac18be elementor-widget elementor-widget-html\" data-id=\"7ac18be\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section class=\"bo-section\" id=\"bo-standards\"><div class=\"bo-wrap\"><p class=\"bo-eyebrow\">Drawing requirements<\/p><h2 class=\"bo-title\">Black Oxide Drawing Requirements<\/h2><p class=\"bo-lead\">State the substrate, standard revision, process class, sealer, treatment area, masking area and inspection method.<\/p><div class=\"bo-table-wrap\" style=\"margin-top:25px\"><table class=\"bo-table\"><thead><tr><th>Standard<\/th><th>Main application<\/th><th>What to specify<\/th><\/tr><\/thead><tbody><tr><td data-label=\"Standard\">MIL-DTL-13924F<\/td><td data-label=\"Main application\">Black conversion coatings for ferrous metals<\/td><td data-label=\"What to specify\">Class, preservative treatment and inspection<\/td><\/tr><tr><td data-label=\"Standard\">SAE AMS2485M<\/td><td data-label=\"Main application\">Engineering and aerospace black oxide<\/td><td data-label=\"What to specify\">Material condition and acceptance<\/td><\/tr><tr><td data-label=\"Standard\">ISO 11408:1999<\/td><td data-label=\"Main application\">Cast iron, carbon, low-alloy and stainless steel<\/td><td data-label=\"What to specify\">Substrate, protection and testing<\/td><\/tr><tr><td data-label=\"Standard\">DIN 50938:2025-06<\/td><td data-label=\"Main application\">Immersion black oxide on ferrous parts<\/td><td data-label=\"What to specify\">Substrate and inspection<\/td><\/tr><tr><td data-label=\"Standard\">SAE AMS2489B<\/td><td data-label=\"Main application\">Color restoration after oxide removal<\/td><td data-label=\"What to specify\">Touch-up area and visual acceptance<\/td><\/tr><\/tbody><\/table><\/div><p class=\"bo-note\">For hardened steel at 39 HRC or above, confirm the specified stress-relief and hydrogen-embrittlement relief requirements before production.<\/p><\/div><\/section>\n<style>\n.bo-section{--bo-blue:#30328e;--bo-navy:#22266c;--bo-ink:#243b46;--bo-muted:#607681;--bo-line:#dce8ed;--bo-pale:#f3f8fb;--bo-cyan:#51acc8;box-sizing:border-box;width:100%;padding:72px 0;font-family:Inter,Arial,sans-serif;color:var(--bo-ink);line-height:1.62}.bo-section *{box-sizing:border-box}.bo-section img{display:block;max-width:100%;height:auto}.bo-section a{color:var(--bo-blue)}.bo-section a:hover{color:var(--bo-navy)}.bo-wrap{width:min(1160px,calc(100% - 40px));margin:0 auto}.bo-eyebrow{margin:0 0 10px;color:var(--bo-blue);font-size:12px;font-weight:800;letter-spacing:.1em;text-transform:uppercase}.bo-title{margin:0 0 14px;color:var(--bo-navy);font-size:clamp(28px,3vw,38px);line-height:1.16}.bo-lead{max-width:780px;margin:0;color:#536a75;font-size:16px}.bo-grid{display:grid;gap:18px}.bo-grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}.bo-grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}.bo-grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}.bo-card{height:100%;padding:22px;border:1px solid var(--bo-line);border-radius:16px;background:#fff;box-shadow:0 7px 20px rgba(37,59,70,.04)}.bo-card h3{margin:0 0 8px;color:var(--bo-navy);font-size:18px;line-height:1.25}.bo-card p{margin:0;color:var(--bo-muted);font-size:14px}.bo-btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 22px;border-radius:9px;background:var(--bo-blue);color:#fff!important;text-decoration:none;font-weight:700}.bo-btn:hover,.bo-btn:focus{background:var(--bo-navy);color:#fff!important}.bo-table-wrap{overflow:hidden;border:1px solid var(--bo-line);border-radius:15px;background:#fff}.bo-table{width:100%;border-collapse:collapse;text-align:left;font-size:14px}.bo-table th,.bo-table td{padding:15px 16px;border-bottom:1px solid var(--bo-line);vertical-align:top}.bo-table th{background:var(--bo-navy);color:#fff;font-size:13px}.bo-table td:first-child{color:var(--bo-navy);font-weight:700}.bo-table tr:last-child td{border-bottom:0}.bo-note{margin-top:17px;padding:14px 17px;border-left:4px solid var(--bo-cyan);border-radius:0 9px 9px 0;background:#eef7fa;color:#536a75;font-size:14px}.bo-media{display:flex;align-items:center;justify-content:center;padding:14px;border:1px solid var(--bo-line);border-radius:20px;background:#fff;box-shadow:0 12px 30px rgba(37,59,70,.08)}.bo-media img{width:100%;max-height:470px;object-fit:contain;border-radius:12px}.bo-split{display:grid;grid-template-columns:1fr 1fr;gap:42px;align-items:center}.bo-steps{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px}.bo-step{padding:18px 14px;border:1px solid var(--bo-line);border-radius:14px;background:#fff}.bo-step b{display:block;margin-bottom:7px;color:var(--bo-navy);font-size:15px}.bo-step span{color:var(--bo-muted);font-size:13px}.bo-faq{display:grid;gap:11px}.bo-faq details{border:1px solid var(--bo-line);border-radius:13px;background:#fff;overflow:hidden}.bo-faq summary{padding:17px 48px 17px 18px;color:var(--bo-navy);font-weight:700;cursor:pointer}.bo-faq .bo-answer{padding:0 18px 17px;color:var(--bo-muted);font-size:14px}.bo-faq .bo-answer p{margin:0}.bo-cta{display:flex;align-items:center;justify-content:space-between;gap:25px;padding:30px;border-radius:18px;background:linear-gradient(135deg,#f5f9ff,#eef7fa)}\n@media(max-width:900px){.bo-grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}.bo-steps{grid-template-columns:repeat(3,minmax(0,1fr))}.bo-split{grid-template-columns:1fr;gap:25px}}\n@media(max-width:640px){.bo-wrap{width:calc(100% - 28px)}.bo-section{padding:50px 0}.bo-grid--2,.bo-grid--3,.bo-grid--4,.bo-steps{grid-template-columns:1fr}.bo-title{font-size:27px}.bo-lead{font-size:15px}.bo-cta{display:block;padding:23px}.bo-cta .bo-btn{width:100%;margin-top:18px}.bo-table-wrap{border:0;background:transparent;overflow:visible}.bo-table,.bo-table thead,.bo-table tbody,.bo-table tr,.bo-table th,.bo-table td{display:block;width:100%}.bo-table thead{display:none}.bo-table tbody{display:grid;gap:11px}.bo-table tr{padding:3px 15px;border:1px solid var(--bo-line);border-radius:13px;background:#fff}.bo-table td{display:grid;grid-template-columns:39% 1fr;gap:10px;padding:11px 0;font-size:13px}.bo-table td::before{content:attr(data-label);color:var(--bo-muted);font-size:12px;font-weight:700}.bo-table td:first-child{color:var(--bo-navy)}.bo-table td:last-child{border-bottom:0}}\n<\/style>\n<style>\n.bo-section .bo-title{font-size:32px!important;line-height:1.2}\n.bo-section h1.bo-title{font-size:35px!important}\n.bo-section .bo-lead{font-size:16px;line-height:1.55}\n.bo-section .bo-card h3{font-size:17px}\n@media(max-width:640px){.bo-section .bo-title,.bo-section h1.bo-title{font-size:26px!important}.bo-section .bo-lead{font-size:15px}.bo-section .bo-card h3{font-size:16px}}\n<\/style>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fef2486 elementor-widget elementor-widget-html\" data-id=\"fef2486\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section class=\"bo-section\" style=\"background:var(--bo-pale)\" id=\"bo-sealer\"><div class=\"bo-wrap\"><div class=\"bo-split\"><div><p class=\"bo-eyebrow\">Appearance and sealing<\/p><h2 class=\"bo-title\">Black Oxide Sealer Options<\/h2><p class=\"bo-lead\">The original surface and selected sealer determine the final shade, gloss and storage protection.<\/p><div class=\"bo-grid bo-grid--2\" style=\"margin-top:22px\"><article class=\"bo-card\"><h3>Oil Seal<\/h3><p>For gears, shafts, tools and lubricated parts.<\/p><\/article><article class=\"bo-card\"><h3>Wax Seal<\/h3><p>For a drier handling surface.<\/p><\/article><article class=\"bo-card\"><h3>Dry-to-Touch Seal<\/h3><p>When oil transfer must be limited.<\/p><\/article><article class=\"bo-card\"><h3>Unsealed<\/h3><p>When another coating or bonding step follows.<\/p><\/article><\/div><\/div><figure class=\"bo-media\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/10\/black-oxide-masking.webp\" alt=\"Masked parts prepared for black oxide coating\" width=\"700\" height=\"500\"><\/figure><\/div><div style=\"height:52px\"><\/div><p class=\"bo-eyebrow\">Performances<\/p><h2 class=\"bo-title\">Benefits of Black Oxide<\/h2><div class=\"bo-grid bo-grid--3\" style=\"margin-top:24px\"><article class=\"bo-card\"><h3>Minimal dimensional change<\/h3><p>Supports threads, bores, shafts and close fits.<\/p><\/article><article class=\"bo-card\"><h3>Low-reflective appearance<\/h3><p>Reduces glare on tools and internal components.<\/p><\/article><article class=\"bo-card\"><h3>Preserved texture<\/h3><p>Retains the original polished, ground or blasted texture.<\/p><\/article><article class=\"bo-card\"><h3>Light corrosion protection<\/h3><p>Sealing supports storage and controlled indoor use.<\/p><\/article><article class=\"bo-card\"><h3>Lubricant retention<\/h3><p>Oiled surfaces retain lubricant on sliding contacts.<\/p><\/article><article class=\"bo-card\"><h3>Base properties preserved<\/h3><p>Strength and hardness remain controlled by the substrate.<\/p><\/article><\/div><\/div><\/section>\n<style>\n.bo-section{--bo-blue:#30328e;--bo-navy:#22266c;--bo-ink:#243b46;--bo-muted:#607681;--bo-line:#dce8ed;--bo-pale:#f3f8fb;--bo-cyan:#51acc8;box-sizing:border-box;width:100%;padding:72px 0;font-family:Inter,Arial,sans-serif;color:var(--bo-ink);line-height:1.62}.bo-section *{box-sizing:border-box}.bo-section img{display:block;max-width:100%;height:auto}.bo-section a{color:var(--bo-blue)}.bo-section a:hover{color:var(--bo-navy)}.bo-wrap{width:min(1160px,calc(100% - 40px));margin:0 auto}.bo-eyebrow{margin:0 0 10px;color:var(--bo-blue);font-size:12px;font-weight:800;letter-spacing:.1em;text-transform:uppercase}.bo-title{margin:0 0 14px;color:var(--bo-navy);font-size:clamp(28px,3vw,38px);line-height:1.16}.bo-lead{max-width:780px;margin:0;color:#536a75;font-size:16px}.bo-grid{display:grid;gap:18px}.bo-grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}.bo-grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}.bo-grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}.bo-card{height:100%;padding:22px;border:1px solid var(--bo-line);border-radius:16px;background:#fff;box-shadow:0 7px 20px rgba(37,59,70,.04)}.bo-card h3{margin:0 0 8px;color:var(--bo-navy);font-size:18px;line-height:1.25}.bo-card p{margin:0;color:var(--bo-muted);font-size:14px}.bo-btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 22px;border-radius:9px;background:var(--bo-blue);color:#fff!important;text-decoration:none;font-weight:700}.bo-btn:hover,.bo-btn:focus{background:var(--bo-navy);color:#fff!important}.bo-table-wrap{overflow:hidden;border:1px solid var(--bo-line);border-radius:15px;background:#fff}.bo-table{width:100%;border-collapse:collapse;text-align:left;font-size:14px}.bo-table th,.bo-table td{padding:15px 16px;border-bottom:1px solid var(--bo-line);vertical-align:top}.bo-table th{background:var(--bo-navy);color:#fff;font-size:13px}.bo-table td:first-child{color:var(--bo-navy);font-weight:700}.bo-table tr:last-child td{border-bottom:0}.bo-note{margin-top:17px;padding:14px 17px;border-left:4px solid var(--bo-cyan);border-radius:0 9px 9px 0;background:#eef7fa;color:#536a75;font-size:14px}.bo-media{display:flex;align-items:center;justify-content:center;padding:14px;border:1px solid var(--bo-line);border-radius:20px;background:#fff;box-shadow:0 12px 30px rgba(37,59,70,.08)}.bo-media img{width:100%;max-height:470px;object-fit:contain;border-radius:12px}.bo-split{display:grid;grid-template-columns:1fr 1fr;gap:42px;align-items:center}.bo-steps{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px}.bo-step{padding:18px 14px;border:1px solid var(--bo-line);border-radius:14px;background:#fff}.bo-step b{display:block;margin-bottom:7px;color:var(--bo-navy);font-size:15px}.bo-step span{color:var(--bo-muted);font-size:13px}.bo-faq{display:grid;gap:11px}.bo-faq details{border:1px solid var(--bo-line);border-radius:13px;background:#fff;overflow:hidden}.bo-faq summary{padding:17px 48px 17px 18px;color:var(--bo-navy);font-weight:700;cursor:pointer}.bo-faq .bo-answer{padding:0 18px 17px;color:var(--bo-muted);font-size:14px}.bo-faq .bo-answer p{margin:0}.bo-cta{display:flex;align-items:center;justify-content:space-between;gap:25px;padding:30px;border-radius:18px;background:linear-gradient(135deg,#f5f9ff,#eef7fa)}\n@media(max-width:900px){.bo-grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}.bo-steps{grid-template-columns:repeat(3,minmax(0,1fr))}.bo-split{grid-template-columns:1fr;gap:25px}}\n@media(max-width:640px){.bo-wrap{width:calc(100% - 28px)}.bo-section{padding:50px 0}.bo-grid--2,.bo-grid--3,.bo-grid--4,.bo-steps{grid-template-columns:1fr}.bo-title{font-size:27px}.bo-lead{font-size:15px}.bo-cta{display:block;padding:23px}.bo-cta .bo-btn{width:100%;margin-top:18px}.bo-table-wrap{border:0;background:transparent;overflow:visible}.bo-table,.bo-table thead,.bo-table tbody,.bo-table tr,.bo-table th,.bo-table td{display:block;width:100%}.bo-table thead{display:none}.bo-table tbody{display:grid;gap:11px}.bo-table tr{padding:3px 15px;border:1px solid var(--bo-line);border-radius:13px;background:#fff}.bo-table td{display:grid;grid-template-columns:39% 1fr;gap:10px;padding:11px 0;font-size:13px}.bo-table td::before{content:attr(data-label);color:var(--bo-muted);font-size:12px;font-weight:700}.bo-table td:first-child{color:var(--bo-navy)}.bo-table td:last-child{border-bottom:0}}\n<\/style>\n<style>\n.bo-section .bo-title{font-size:32px!important;line-height:1.2}\n.bo-section h1.bo-title{font-size:35px!important}\n.bo-section .bo-lead{font-size:16px;line-height:1.55}\n.bo-section .bo-card h3{font-size:17px}\n@media(max-width:640px){.bo-section .bo-title,.bo-section h1.bo-title{font-size:26px!important}.bo-section .bo-lead{font-size:15px}.bo-section .bo-card h3{font-size:16px}}\n<\/style>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f6bfc25 elementor-widget elementor-widget-html\" data-id=\"f6bfc25\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section class=\"bo-section\" id=\"bo-comparison\"><div class=\"bo-wrap\"><p class=\"bo-eyebrow\">Finish comparison<\/p><h2 class=\"bo-title\">Black Oxide vs. Black Zinc<\/h2><p class=\"bo-lead\">Choose black oxide for minimal buildup and low glare. Choose black zinc for stronger sacrificial corrosion protection.<\/p><div class=\"bo-table-wrap\" style=\"margin-top:24px\"><table class=\"bo-table\"><thead><tr><th>Key difference<\/th><th>Oxyde noir<\/th><th>Black zinc<\/th><\/tr><\/thead><tbody><tr><td data-label=\"Key difference\">Formation<\/td><td data-label=\"Black oxide\">Chemical conversion of the ferrous surface<\/td><td data-label=\"Black zinc\">Electrodeposited zinc with black passivation<\/td><\/tr><tr><td data-label=\"Key difference\">Dimensional buildup<\/td><td data-label=\"Black oxide\">Negligible in normal processing<\/td><td data-label=\"Black zinc\">Measurable thickness as specified<\/td><\/tr><tr><td data-label=\"Key difference\">Protection contre la corrosion<\/td><td data-label=\"Black oxide\">Light duty with suitable sealing<\/td><td data-label=\"Black zinc\">Higher sacrificial protection<\/td><\/tr><tr><td data-label=\"Key difference\">Pi\u00e8ces courantes<\/td><td data-label=\"Black oxide\">Tools, gears, shafts and fixtures<\/td><td data-label=\"Black zinc\">Exposed fasteners and brackets<\/td><\/tr><\/tbody><\/table><\/div><div style=\"height:52px\"><\/div><div class=\"bo-split\" style=\"align-items:start\"><div><p class=\"bo-eyebrow\">Masking and fit<\/p><h2 class=\"bo-title\">What Should Be Masked?<\/h2><p class=\"bo-lead\">Masking protects surfaces where oxide or sealer could affect the next operation.<\/p><\/div><div class=\"bo-grid bo-grid--2\"><div class=\"bo-card\"><h3>Functional areas<\/h3><p>Threads, precision bores, sealing faces and electrical contacts.<\/p><\/div><div class=\"bo-card\"><h3>Process boundaries<\/h3><p>Bonding, welding, vacuum and customer-specified bare areas.<\/p><\/div><\/div><\/div><\/div><\/section>\n<style>\n.bo-section{--bo-blue:#30328e;--bo-navy:#22266c;--bo-ink:#243b46;--bo-muted:#607681;--bo-line:#dce8ed;--bo-pale:#f3f8fb;--bo-cyan:#51acc8;box-sizing:border-box;width:100%;padding:72px 0;font-family:Inter,Arial,sans-serif;color:var(--bo-ink);line-height:1.62}.bo-section *{box-sizing:border-box}.bo-section img{display:block;max-width:100%;height:auto}.bo-section a{color:var(--bo-blue)}.bo-section a:hover{color:var(--bo-navy)}.bo-wrap{width:min(1160px,calc(100% - 40px));margin:0 auto}.bo-eyebrow{margin:0 0 10px;color:var(--bo-blue);font-size:12px;font-weight:800;letter-spacing:.1em;text-transform:uppercase}.bo-title{margin:0 0 14px;color:var(--bo-navy);font-size:clamp(28px,3vw,38px);line-height:1.16}.bo-lead{max-width:780px;margin:0;color:#536a75;font-size:16px}.bo-grid{display:grid;gap:18px}.bo-grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}.bo-grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}.bo-grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}.bo-card{height:100%;padding:22px;border:1px solid var(--bo-line);border-radius:16px;background:#fff;box-shadow:0 7px 20px rgba(37,59,70,.04)}.bo-card h3{margin:0 0 8px;color:var(--bo-navy);font-size:18px;line-height:1.25}.bo-card p{margin:0;color:var(--bo-muted);font-size:14px}.bo-btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 22px;border-radius:9px;background:var(--bo-blue);color:#fff!important;text-decoration:none;font-weight:700}.bo-btn:hover,.bo-btn:focus{background:var(--bo-navy);color:#fff!important}.bo-table-wrap{overflow:hidden;border:1px solid var(--bo-line);border-radius:15px;background:#fff}.bo-table{width:100%;border-collapse:collapse;text-align:left;font-size:14px}.bo-table th,.bo-table td{padding:15px 16px;border-bottom:1px solid var(--bo-line);vertical-align:top}.bo-table th{background:var(--bo-navy);color:#fff;font-size:13px}.bo-table td:first-child{color:var(--bo-navy);font-weight:700}.bo-table tr:last-child td{border-bottom:0}.bo-note{margin-top:17px;padding:14px 17px;border-left:4px solid var(--bo-cyan);border-radius:0 9px 9px 0;background:#eef7fa;color:#536a75;font-size:14px}.bo-media{display:flex;align-items:center;justify-content:center;padding:14px;border:1px solid var(--bo-line);border-radius:20px;background:#fff;box-shadow:0 12px 30px rgba(37,59,70,.08)}.bo-media img{width:100%;max-height:470px;object-fit:contain;border-radius:12px}.bo-split{display:grid;grid-template-columns:1fr 1fr;gap:42px;align-items:center}.bo-steps{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px}.bo-step{padding:18px 14px;border:1px solid var(--bo-line);border-radius:14px;background:#fff}.bo-step b{display:block;margin-bottom:7px;color:var(--bo-navy);font-size:15px}.bo-step span{color:var(--bo-muted);font-size:13px}.bo-faq{display:grid;gap:11px}.bo-faq details{border:1px solid var(--bo-line);border-radius:13px;background:#fff;overflow:hidden}.bo-faq summary{padding:17px 48px 17px 18px;color:var(--bo-navy);font-weight:700;cursor:pointer}.bo-faq .bo-answer{padding:0 18px 17px;color:var(--bo-muted);font-size:14px}.bo-faq .bo-answer p{margin:0}.bo-cta{display:flex;align-items:center;justify-content:space-between;gap:25px;padding:30px;border-radius:18px;background:linear-gradient(135deg,#f5f9ff,#eef7fa)}\n@media(max-width:900px){.bo-grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}.bo-steps{grid-template-columns:repeat(3,minmax(0,1fr))}.bo-split{grid-template-columns:1fr;gap:25px}}\n@media(max-width:640px){.bo-wrap{width:calc(100% - 28px)}.bo-section{padding:50px 0}.bo-grid--2,.bo-grid--3,.bo-grid--4,.bo-steps{grid-template-columns:1fr}.bo-title{font-size:27px}.bo-lead{font-size:15px}.bo-cta{display:block;padding:23px}.bo-cta .bo-btn{width:100%;margin-top:18px}.bo-table-wrap{border:0;background:transparent;overflow:visible}.bo-table,.bo-table thead,.bo-table tbody,.bo-table tr,.bo-table th,.bo-table td{display:block;width:100%}.bo-table thead{display:none}.bo-table tbody{display:grid;gap:11px}.bo-table tr{padding:3px 15px;border:1px solid var(--bo-line);border-radius:13px;background:#fff}.bo-table td{display:grid;grid-template-columns:39% 1fr;gap:10px;padding:11px 0;font-size:13px}.bo-table td::before{content:attr(data-label);color:var(--bo-muted);font-size:12px;font-weight:700}.bo-table td:first-child{color:var(--bo-navy)}.bo-table td:last-child{border-bottom:0}}\n<\/style>\n<style>\n.bo-section .bo-title{font-size:32px!important;line-height:1.2}\n.bo-section h1.bo-title{font-size:35px!important}\n.bo-section .bo-lead{font-size:16px;line-height:1.55}\n.bo-section .bo-card h3{font-size:17px}\n@media(max-width:640px){.bo-section .bo-title,.bo-section h1.bo-title{font-size:26px!important}.bo-section .bo-lead{font-size:15px}.bo-section .bo-card h3{font-size:16px}}\n<\/style>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-160baf3 elementor-widget elementor-widget-html\" data-id=\"160baf3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section class=\"bo-section\" style=\"background:var(--bo-pale)\" id=\"bo-inspection\"><div class=\"bo-wrap\"><div class=\"bo-split\"><div><p class=\"bo-eyebrow\">Acceptance check<\/p><h2 class=\"bo-title\">Black Oxide Defects and Inspection<\/h2><p class=\"bo-lead\">Weldo checks coverage, appearance, sealing, cleanliness and critical dimensions before shipment.<\/p><div class=\"bo-table-wrap\" style=\"margin-top:22px\"><table class=\"bo-table\"><thead><tr><th>D\u00e9faut<\/th><th>Inspection focus<\/th><\/tr><\/thead><tbody><tr><td data-label=\"Defect\">Uneven color<\/td><td data-label=\"Inspection focus\">Material, cleaning, bath and surface texture<\/td><\/tr><tr><td data-label=\"Defect\">Rust stains<\/td><td data-label=\"Inspection focus\">Rinsing, sealing and packaging<\/td><\/tr><tr><td data-label=\"Defect\">Bare areas<\/td><td data-label=\"Inspection focus\">Oil, scale, activation and rack contact<\/td><\/tr><tr><td data-label=\"Defect\">Smut or residue<\/td><td data-label=\"Inspection focus\">Reaction control and rinsing<\/td><\/tr><\/tbody><\/table><\/div><\/div><figure class=\"bo-media\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/10\/black-oxide-inspection.webp\" alt=\"Inspection of black oxide coated precision parts\" width=\"700\" height=\"500\"><\/figure><\/div><div style=\"height:54px\"><\/div><p class=\"bo-eyebrow\">Custom parts<\/p><h2 class=\"bo-title\">Common Black Oxide Parts<\/h2><p class=\"bo-lead\">Black oxide suits precision ferrous-metal parts that need a dark finish with minimal buildup.<\/p><div class=\"bo-grid bo-grid--3\" style=\"margin-top:23px\"><article class=\"bo-card\"><h3>Machinery & Automation<\/h3><p>Locating pins, guide shafts, couplings and fixtures.<\/p><\/article><article class=\"bo-card\"><h3>Automotive & Transmission<\/h3><p>Gears, splined shafts, bushings and washers.<\/p><\/article><article class=\"bo-card\"><h3>Tooling & Molds<\/h3><p>Punches, dies, holders and fixture components.<\/p><\/article><article class=\"bo-card\"><h3>Optical & Instruments<\/h3><p>Lens mounts, adjustment rings and internal supports.<\/p><\/article><article class=\"bo-card\"><h3>Fasteners & Hardware<\/h3><p>Bolts, nuts, screws, washers and retaining rings.<\/p><\/article><article class=\"bo-card\"><h3>\u00c9quipement industriel<\/h3><p>Brackets, control parts and internal mechanisms.<\/p><\/article><\/div><\/div><\/section>\n<style>\n.bo-section{--bo-blue:#30328e;--bo-navy:#22266c;--bo-ink:#243b46;--bo-muted:#607681;--bo-line:#dce8ed;--bo-pale:#f3f8fb;--bo-cyan:#51acc8;box-sizing:border-box;width:100%;padding:72px 0;font-family:Inter,Arial,sans-serif;color:var(--bo-ink);line-height:1.62}.bo-section *{box-sizing:border-box}.bo-section img{display:block;max-width:100%;height:auto}.bo-section a{color:var(--bo-blue)}.bo-section a:hover{color:var(--bo-navy)}.bo-wrap{width:min(1160px,calc(100% - 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28px)}.bo-section{padding:50px 0}.bo-grid--2,.bo-grid--3,.bo-grid--4,.bo-steps{grid-template-columns:1fr}.bo-title{font-size:27px}.bo-lead{font-size:15px}.bo-cta{display:block;padding:23px}.bo-cta .bo-btn{width:100%;margin-top:18px}.bo-table-wrap{border:0;background:transparent;overflow:visible}.bo-table,.bo-table thead,.bo-table tbody,.bo-table tr,.bo-table th,.bo-table td{display:block;width:100%}.bo-table thead{display:none}.bo-table tbody{display:grid;gap:11px}.bo-table tr{padding:3px 15px;border:1px solid var(--bo-line);border-radius:13px;background:#fff}.bo-table td{display:grid;grid-template-columns:39% 1fr;gap:10px;padding:11px 0;font-size:13px}.bo-table td::before{content:attr(data-label);color:var(--bo-muted);font-size:12px;font-weight:700}.bo-table td:first-child{color:var(--bo-navy)}.bo-table td:last-child{border-bottom:0}}\n<\/style>\n<style>\n.bo-section .bo-title{font-size:32px!important;line-height:1.2}\n.bo-section h1.bo-title{font-size:35px!important}\n.bo-section .bo-lead{font-size:16px;line-height:1.55}\n.bo-section .bo-card h3{font-size:17px}\n@media(max-width:640px){.bo-section .bo-title,.bo-section h1.bo-title{font-size:26px!important}.bo-section .bo-lead{font-size:15px}.bo-section .bo-card h3{font-size:16px}}\n<\/style>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fafeb91 elementor-widget elementor-widget-html\" data-id=\"fafeb91\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<section class=\"bo-section\" id=\"bo-faq\"><div class=\"bo-wrap\"><p class=\"bo-eyebrow\">Frequently asked questions<\/p><h2 class=\"bo-title\">Black Oxide FAQs<\/h2><div class=\"bo-faq\" style=\"margin-top:23px\"><details open><summary>Which black oxide standard should be specified on a drawing?<\/summary><div class=\"bo-answer\"><p>Specify the standard and revision together with the substrate, process class, sealer, treated area and inspection requirements.<\/p><\/div><\/details><details><summary>Can Weldo mask threads and precision bores?<\/summary><div class=\"bo-answer\"><p>Yes. Threads, bores, sealing faces, electrical contacts and other functional areas can be masked according to the drawing.<\/p><\/div><\/details><details><summary>Which sealer should be used?<\/summary><div class=\"bo-answer\"><p>Oil suits lubricated parts, wax provides a drier handling surface, and dry-to-touch sealer limits oil transfer.<\/p><\/div><\/details><details><summary>How are black oxide parts inspected?<\/summary><div class=\"bo-answer\"><p>Weldo checks coverage, color, sealing, cleanliness and critical dimensions. Reports and additional testing are available when specified.<\/p><\/div><\/details><details><summary>Can black oxide be combined with CNC machining?<\/summary><div class=\"bo-answer\"><p>Yes. CNC machining, masking, black oxide processing, cleaning and final inspection can be coordinated in one production route.<\/p><\/div><\/details><details><summary>What information is required for a quotation?<\/summary><div class=\"bo-answer\"><p>Send the drawing, material grade, quantity, finish requirement, critical dimensions, masking areas and delivery target.<\/p><\/div><\/details><\/div><div style=\"height:52px\"><\/div><div class=\"bo-cta\" id=\"bo-quote\"><div><p class=\"bo-eyebrow\">Envoyez votre dessin<\/p><h2 class=\"bo-title\" style=\"margin-bottom:8px\">Get a Black Oxide Quote<\/h2><p class=\"bo-lead\">Weldo will review the material, masking, process specification, inspection scope and delivery schedule.<\/p><\/div><a class=\"bo-btn\" href=\"https:\/\/weldomachining.com\/fr\/telechargement-de-fichiers\/\">T\u00e9l\u00e9chargez votre dessin<\/a><\/div><\/div><\/section>\n<style>\n.bo-section{--bo-blue:#30328e;--bo-navy:#22266c;--bo-ink:#243b46;--bo-muted:#607681;--bo-line:#dce8ed;--bo-pale:#f3f8fb;--bo-cyan:#51acc8;box-sizing:border-box;width:100%;padding:72px 0;font-family:Inter,Arial,sans-serif;color:var(--bo-ink);line-height:1.62}.bo-section *{box-sizing:border-box}.bo-section img{display:block;max-width:100%;height:auto}.bo-section a{color:var(--bo-blue)}.bo-section a:hover{color:var(--bo-navy)}.bo-wrap{width:min(1160px,calc(100% - 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Minimal buildup Supports close fits and functional threads. Sealer choices Oil, wax or dry-to-touch options. Controlled process Hot and stainless-grade routes. Final inspection Appearance and critical dimensions checked. Upload [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":15030,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-15026","page","type-page","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/weldomachining.com\/fr\/wp-json\/wp\/v2\/pages\/15026","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/weldomachining.com\/fr\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/weldomachining.com\/fr\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/weldomachining.com\/fr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/weldomachining.com\/fr\/wp-json\/wp\/v2\/comments?post=15026"}],"version-history":[{"count":17,"href":"https:\/\/weldomachining.com\/fr\/wp-json\/wp\/v2\/pages\/15026\/revisions"}],"predecessor-version":[{"id":15378,"href":"https:\/\/weldomachining.com\/fr\/wp-json\/wp\/v2\/pages\/15026\/revisions\/15378"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/weldomachining.com\/fr\/wp-json\/wp\/v2\/media\/15030"}],"wp:attachment":[{"href":"https:\/\/weldomachining.com\/fr\/wp-json\/wp\/v2\/media?parent=15026"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}