Precision Surface Engineering

Surface Finishes

Choose surface finishes for corrosion protection, wear resistance, appearance, surface condition, or part identification. Compare compatible base materials, typical process build, dimensional impact, and the drawing inputs needed for a reliable quote.

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Finish by function

Start with the result the part needs

Surface finishing should be selected around the base material, service environment, wear surfaces, cosmetic standard, and dimensions that must remain controlled after treatment.

Corrosion protection

Protect the base material

Anodizing, zinc plating, nickel finishes, passivation, black oxide, painting, and powder coating.

Wear & hardness

Improve working surfaces

Hard anodizing, electroless nickel, hard chrome, heat treatment, and polishing for controlled interfaces.

Appearance & texture

Control color and visual consistency

Bead blasting, brushing, polishing, painting, powder coating, anodizing, and decorative plating.

Cleanliness & roughness

Improve surface condition

Electropolishing, passivation, and mechanical polishing for cleaner or smoother exposed surfaces.

Identification

Add durable part information

Laser marking for serial numbers, data codes, logos, orientation marks, and part traceability.

Engineering comparison

Surface finish selection and parameter table

Use the ranges below for early design and RFQ planning. Final coating thickness, material removal, color, texture, masking, and acceptance criteria are confirmed against the selected specification and part drawing.

Comparison of surface finishes by base material, function, typical thickness or material change, dimensional effect, and selection limits.
Finish	Suitable base materials	Primary function	Typical build / removal	Dimensional effect	Key selection limits
Type II anodizing	Aluminum alloys	Corrosion protection, color, electrical insulation, cosmetic finish	Common planning range: 5–25 μm	Coating growth affects bores, threads, and close fits	Alloy and surface condition affect color; specify masking and sealed or unsealed condition
Hard anodizing	Aluminum alloys	Wear resistance, harder surface, corrosion protection, dielectric layer	Common planning range: 25–75 μm	More buildup than Type II; allowance may be needed on precision features	Color is usually darker and less cosmetic; sharp edges and threaded features need review
Bead blasting	Aluminum, stainless steel, steel, titanium, and selected plastics	Uniform matte texture, machining-mark reduction, surface preparation	No coating; slight material removal depends on media and pressure	Normally low, but edges and small features can soften	Media, grit, pressure, and visual sample should be defined for cosmetic consistency
Powder coating	Steel, stainless steel, aluminum, and other conductive metals	Corrosion protection, color, outdoor or industrial cosmetic finish	Common planning range: 60–120 μm	Noticeable film build; mask threads, grounding points, bores, and mating faces	Specify color standard, gloss, texture, environment, and cosmetic acceptance level
Electroless nickel	Steel, stainless steel, aluminum, copper alloys, and compatible substrates	Uniform corrosion protection, wear resistance, hardness, dimensional restoration	Common planning range: 5–50 μm	Relatively uniform buildup across complex geometry and internal surfaces	Specify phosphorus level, thickness, heat treatment, masking, and critical final dimensions
Zinc plating	Carbon and low-alloy steels	Sacrificial corrosion protection for steel hardware and components	Common planning range: 5–25 μm	Build affects threads and fitted features	Specify chromate color and corrosion requirement; high-strength steels need hydrogen-embrittlement review
Electrolytic nickel	Steel, stainless steel, copper alloys, and prepared substrates	Corrosion protection, decorative appearance, wear layer, or plating undercoat	Common planning range: 5–25 μm	Thickness varies with current density and part geometry	Recesses and edges plate differently; define cosmetic class, thickness location, and underplate
Chrome plating	Steel and compatible plated metal substrates	Hard chrome for wear and restoration; decorative chrome for appearance	Hard chrome often 10–100+ μm; decorative systems are much thinner	Hard chrome may require machining or grinding to final size	Specify hard or decorative chrome, finished dimension, grinding allowance, and exposure conditions
Passivation	Stainless steels	Remove free iron and support the natural corrosion-resistant passive surface	No intentional coating thickness	Negligible dimensional change	Not a substitute for electropolishing or plating; stainless grade and required specification matter
Electropolishing	Primarily stainless steel; selected compatible alloys	Lower surface roughness, cleaner surface, burr reduction, improved passivity	Typical material removal: approximately 5–25 μm	Removes material and can round edges or enlarge openings	Specify pre-finish Ra, target condition, critical edges, and dimensions measured after finishing
Black oxide	Ferrous steels and compatible stainless grades	Black appearance, low buildup, mild corrosion protection with oil or seal	Conversion layer typically below 2 μm	Very low dimensional effect	Limited protection in severe outdoor or chemical exposure; post-treatment oil or seal is important
Brushing	Aluminum, stainless steel, and other workable metals	Directional grain, cosmetic consistency, preparation before anodizing or coating	No coating; small material removal	Usually low, but can affect sharp edges and thin cosmetic surfaces	Define grain direction, grit, protected faces, and approved visual sample
Polishing	Metals and selected plastics	Reduce roughness, improve appearance, prepare sealing or functional surfaces	Material removal depends on starting condition and target finish	Can alter edges, radii, flatness, and feature definition	Specify target Ra or visual standard instead of terms such as “mirror” alone
Heat treatment	Steels, tool steels, aluminum alloys, titanium, and other heat-treatable alloys	Hardness, strength, wear behavior, stress relief, or dimensional stabilization	No coating; metallurgical change may include a specified case depth	Distortion and scale are process-dependent; finish machining may be required	Specify alloy, starting condition, target hardness, case depth, and dimensions controlled after treatment
Industrial painting	Metal and plastic parts with compatible preparation and primer systems	Color, branding, UV or chemical exposure protection, cosmetic surface	System-dependent; define primer, topcoat, and target dry-film thickness	Film build affects fits, edges, text, and small openings	Specify color reference, gloss, texture, environment, masking, and cosmetic defect limits
Laser marking	Many metals and plastics, subject to contrast testing	Serial numbers, QR/Data Matrix codes, logos, labels, and orientation marks	Negligible buildup; depth depends on marking method	Usually negligible outside deep engraving	Material, finish, contrast, code size, scan requirement, artwork, and marking location must be defined

Dimensioning note: identify threads, bearing fits, sealing faces, electrical contacts, grounding points, and datums that must be masked or controlled after finishing. Do not apply a coating range as a blanket tolerance to every feature.

Detailed finish pages

Review materials, standards, colors, and design limits

Open a finish below for process-specific guidance. Include the finish specification on the drawing whenever compliance to a named standard, thickness class, color, gloss, texture, or test method is required.

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Surface Finishes

Start with the result the part needs

Protect the base material

Improve working surfaces

Control color and visual consistency

Improve surface condition

Add durable part information

Surface finish selection and parameter table

Review materials, standards, colors, and design limits

Define the finish before pricing

Base material

Finish requirement

Controlled surfaces

Acceptance criteria

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