Surface Finishing Services
Choose from 50+ surface finishing options to improve appearance, corrosion resistance, wear performance, texture and cleanability for custom parts.
How to Select a Surface Finish
Start with the base material, operating environment, functional surfaces and visual standard; then confirm coating thickness, masking and inspection.
Corrosion Protection
Anodizing, conversion coating, plating, black oxide, paint or E-coating.
Wear and Hardness
Hard anodizing, nickel plating or suitable heat treatment.
Appearance and Texture
Polishing, brushing, blasting, coloring or coating.
Grip and Contact
Knurling or rubber lagging for selected handles, knobs and rollers.
Coating Preparation
Blasting or phosphating before a compatible coating system.
Dimensional Control
Allow for coating buildup, masking, contact points and post-machining.
The processes below show common options only. Weldo offers 50+ standard and custom finishes, including project-specific colors, textures, coatings and combined process routes.
Contact Us for Custom FinishesElectrochemical Surface Finishes
These processes add or convert a surface layer. Electrical contact, racking marks, coating buildup and substrate preparation must be defined early.
Electroplating
Metal coating for corrosion, wear, conductivity or appearance; substrate and plating system must be matched.
Anodizing
Protective oxide layer for aluminum; Type II and hard anodizing differ in thickness and performance.
Alodine
Thin conductive conversion coating used mainly on aluminum for corrosion protection and paint preparation.
Electroless Plating
Uniform chemical deposit suited to complex geometry; nickel systems are common after suitable pretreatment.
Electrolytic Coloring
Electrochemical coloring for compatible aluminum surfaces and decorative applications.
E-Coating
Uniform electrically deposited paint film for steel, aluminum and other compatible conductive parts.
Mechanical Surface Finishes
Mechanical finishing changes texture, roughness or grip without relying on a deposited protective coating.
Polishing
Reduces roughness and improves gloss on suitable metals and selected plastics.
Knurling
Creates a functional texture for grip on handles, knobs and cylindrical components.
Brushing
Produces a directional cosmetic grain that can help conceal minor surface variation.
Sandblasting
Cleans or textures accessible surfaces and can prepare them for compatible coatings.
Specify the required Ra range, gloss or texture reference, grain direction, protected edges and cosmetic surfaces on the drawing.
Conversion, Coating and Specialty Processes
These options cover steel pretreatment, property modification, thin conversion layers and bonded protective coverings.
Phosphating
Phosphate layer for steel corrosion protection and coating adhesion.
Heat Treatment
Controlled heating and cooling to change material properties; dimensional movement must be reviewed.
Black Oxide
Thin conversion finish for steel with minimal dimensional change and supplementary oil or seal.
Rubber Lagging
Bonded rubber covering that adds friction and wear protection to rollers and contact surfaces.
Coating / Painting
Protective or decorative barrier coating for compatible metals and selected plastics.
Heat treatment changes bulk or near-surface properties and should not be treated as a purely cosmetic finish.
Material and Finish Compatibility
The same finish name can produce different results across alloys, tempers, surface conditions and suppliers.
| Material | Common Options | Key Review Point |
|---|---|---|
| Aluminum | Anodizing, Alodine, plating, painting, E-coating, blasting, polishing | Alloy and temper affect color, hardness and corrosion response. |
| Stainless Steel | Passivation, electropolishing, polishing, brushing, blasting, plating | Avoid contamination and define cosmetic direction or Ra. |
| Carbon / Alloy Steel | Plating, phosphating, black oxide, painting, heat treatment | Corrosion system and hardness requirement should be specified separately. |
| Copper / Brass | Plating, polishing, brushing, chemical coloring | Oxidation, conductivity and exposed contact areas require review. |
| Titanium | Anodizing, blasting, polishing, selected coatings | Grade, color target and fatigue-critical surfaces need confirmation. |
| Engineering Plastics | Polishing, painting, blasting or plating for compatible grades | Adhesion, solvent sensitivity, heat and outgassing can limit options. |
Compatibility must be confirmed for the exact grade, heat condition, geometry and performance specification.
Surface Finish Quality Control
Clear drawings and measurable acceptance criteria prevent disputes over color, texture, buildup and protected features.
Coating Thickness
Define whether thickness is total buildup or per surface and account for critical fits.
Masking
Mark threads, sealing faces, electrical contacts, bearing seats and datums that must remain untreated.
Internal Features
Deep blind holes and enclosed passages may receive limited or uneven treatment.
Racking and Contact
Allow non-cosmetic locations for electrical contact, hanging or fixture marks.
Appearance Standard
Specify color code, gloss, texture, grain direction and an approved sample when cosmetic.
Inspection
Define adhesion, thickness, roughness, color, corrosion or hardness tests only where required.
Frequently Asked Questions
Concise guidance on coverage, acceptance, cost, tolerances, quotation details and combined processes.
Does treatment cover both exterior and interior surfaces?
Accessible surfaces are generally treated. Deep blind holes, enclosed passages and areas without adequate solution flow or electrical contact may receive limited coverage.
How is surface-finish quality accepted?
Use the drawing and approved sample to verify appearance, thickness, adhesion, roughness, color and required performance tests.
How much does surface finishing add to cost?
Cost depends on process, material, masking, part size, quantity, color control, testing and handling. A fixed percentage is not reliable without reviewing the part.
Can a finish change dimensions and tolerances?
Yes. Deposited or converted layers can change size. Critical fits may require allowance, masking, plugging or finish machining.
Which file information is needed for a quote?
Provide the 3D model and drawing with material grade, finish specification, color, gloss, protected surfaces, quantity and inspection requirements.
Can different finishes be combined?
Yes, when the process sequence and material compatibility are validated—for example, blasting before anodizing or phosphating before painting.
Review the Finish Before Production
Upload the part files and identify the material, finish, color, protected areas and acceptance requirements.
Upload Files for Finish Review