Surface Finishing for CNC Machined Parts
Weldo provides one-stop surface finish services for CNC-machined metal and plastic parts, including process selection, masking, treatment, inspection, and delivery coordination.
Upload Files for Finish ReviewChoose the Finish from the Part Requirement
Start with the base material, service environment, critical dimensions, and required performance.
Corrosion Protection
Select protection according to moisture, chemicals, salt exposure, and outdoor service.
Wear & Hardness
Specify contact pressure, sliding motion, target hardness, and expected service life.
Appearance & Texture
Define color, gloss, texture, grain direction, and approved visual standards.
Fits & Critical Surfaces
Control coating allowance, masking, threads, sealing faces, and final dimensions.
Chemical & Electrochemical Finishes
These processes add corrosion protection, controlled color, conductivity, hardness, or a functional metallic layer.
Electroplating
Metal coatings for corrosion resistance, conductivity, wear control, or appearance.
Anodizing
Protective and decorative oxide finishes for aluminum, including hard anodizing.
Alodine Finish
Thin conversion coating for aluminum requiring corrosion protection and conductivity.
Nickel Plating
Metallic nickel coating for corrosion, wear, dimensional restoration, or conductivity.
Passivation
Removes free iron and supports the corrosion resistance of stainless steel parts.
E-Coating
Uniform protective coating for conductive metal parts and complex geometries.
Mechanical Finishes
Mechanical processes control texture, reflectivity, edge condition, and tactile appearance.
Polishing
Reduces surface roughness and produces a smooth or reflective finish.
Brushing
Creates a controlled directional grain on visible metal surfaces.
Sandblasting
Cleans, profiles, and creates uniform matte textures with controlled abrasive media.
Knurling
Adds a patterned gripping surface to knobs, shafts, handles, and fasteners.
Protective & Specialty Processes
These treatments protect the substrate, prepare it for coating, or modify material performance.
Black Oxide
Low-build black conversion finish for ferrous components and precision dimensions.
Phosphating
Steel pretreatment for corrosion protection, lubrication, or coating adhesion.
Painting & Powder Coating
Colored barrier coatings for appearance and environmental protection.
Heat Treatment
Controls hardness, strength, toughness, wear performance, and dimensional stability.
Other Common Surface Finishes
Additional processes are selected according to material, function, production quantity, and acceptance requirements.
| Surface Finish | Typical Purpose |
|---|---|
| Bead Blasting | Creates a fine matte texture and reduces light machining marks. |
| Vibratory Finishing | Deburrs and smooths small metal or plastic parts in production batches. |
| Shot Peening | Introduces compressive residual stress to improve fatigue performance. |
| PVD or DLC Coating | Adds a thin hard layer for wear resistance, low friction, or color. |
| PTFE Coating | Provides low friction, release properties, and chemical resistance. |
| Zinc Flake Coating | Protects steel fasteners and components in corrosive service. |
| Laser Marking | Adds permanent part numbers, logos, and traceability codes. |
Match the Process to the Base Material
Confirm the exact material grade, heat-treatment state, and required performance before selecting a finish.
| Material | Common Finishes | Review Focus |
|---|---|---|
| Aluminum | Anodizing, Alodine, plating, painting | Alloy, temper, thickness, color, and electrical contact areas |
| Stainless Steel | Passivation, polishing, brushing, blasting | Grade, surface roughness, grain direction, and contamination control |
| Carbon & Alloy Steel | Plating, black oxide, phosphating, painting | Corrosion system, hardness, hydrogen relief, and final dimensions |
| Copper & Brass | Plating, polishing, brushing, protective coating | Conductivity, soldering, visible surfaces, and exposed contacts |
| Titanium | Anodizing, blasting, polishing, PVD | Grade, color target, surface cleanliness, and fatigue-critical areas |
| Engineering Plastics | Polishing, painting, texturing, compatible plating | Adhesion, heat resistance, solvent sensitivity, and appearance |
Specify the Finish before Production
Clear requirements protect critical features and establish consistent acceptance standards.
Coating Thickness
Define allowable buildup on diameters, holes, threads, and mating surfaces.
Masking
Mark bearing seats, sealing faces, electrical contacts, and untreated areas.
Cosmetic Standard
Specify color, gloss, texture, grain direction, or an approved limit sample.
Inspection
Define checks for thickness, adhesion, roughness, color, corrosion, and dimensions.