Surface Finishing Service
Professional surface finishing services for CNC machined parts.
Overview
PiPrecision provides comprehensive surface finishing services to enhance the appearance, durability, and performance of your precision-machined components. From decorative anodizing in custom colors to hard anodizing for wear resistance, our finishing capabilities meet both aesthetic and functional requirements.
Our finishing department operates under ISO 9001 quality standards, ensuring consistent results with every batch. If you need cosmetic finishes for consumer products, we deliver the right surface treatment for your specific needs.
With more than six years of export experience, one-piece minimum orders, CAD quote review within 24 hours, and production lead times from two weeks, we coordinate finishing requirements around your project. Final timing and capabilities are subject to drawing review.
Capabilities
Decorative sulfuric acid anodizing, various colors
Wear-resistant hard coat, up to 0.003" thickness
Durable organic coating, wide color range
Uniform matte finish for cosmetic applications
Stainless steel corrosion resistance treatment
Chemical conversion coating for aluminum
Stainless steel bright, smooth finish
Decorative black finish for steel
Nickel, gold, silver, tin, etc.
Permanent part marking and serialization
Quality Assurance
- Coating thickness measurement (eddy current, X-ray)
- Salt spray testing for corrosion resistance
- Adhesion testing (cross-hatch, tape test)
- Color matching with spectrophotometer
Specifications
| Type II Coating Thickness | 0.005mm - 0.025mm (0.0002" - 0.001") |
| Type III Coating Thickness | 0.025mm - 0.075mm (0.001" - 0.003") |
| Type II Standard Colors | Clear, Black, Blue, Red, Gold, Green, etc. |
| Type III Colors | Black only (dyeable to dark colors) |
| Type II Hardness | 300-400 HV |
| Type III Hardness | 400-500 HV |
| Type II Corrosion Resistance | 336+ hrs salt spray |
| Type III Corrosion Resistance | 1000+ hrs salt spray |
| Powder Coating Thickness | 0.05mm - 0.15mm (0.002" - 0.006") |
| Powder Coating Colors | RAL colors, custom matches |
| Powder Coating Salt Spray | 1000+ hrs |
Published capabilities are indicative and subject to drawing review.
Equipment
Primary Machines
- Anodizing Line — Type II & III sulfuric acid anodizing
- Powder Coating Booth — Electrostatic spray application
- Bead Blasting Cabinet — Glass, ceramic, aluminum oxide media
- Passivation Line — Nitric and citric acid processes
Inspection Equipment
- Eddy Current Thickness Gauge — Non-destructive coating measurement
- X-Ray Fluorescence — Precise thickness analysis
- Salt Spray Chamber — ASTM B117 corrosion testing
- Spectrophotometer — Color matching and verification
Materials
| Material | Grades | Applications |
|---|---|---|
| Aluminum 6061/7075 | All series | All anodizing types, chem film, powder coat, plating |
| Stainless Steel 300 Series | 304, 316, 303 | Passivation, electropolishing, bead blast, plating |
| Stainless Steel 400 Series | 410, 416, 440C | Passivation, black oxide, plating |
| Carbon Steel | 1018, 4140, C45 | Powder coat, black oxide, phosphate, plating |
| Titanium | Grade 2, Grade 5 | Decorative anodizing (colors only) |
| Brass/Bronze/Copper | C360, C464, C932, C110 | Clear coat, powder coat, patina |
Sample Parts
Why Choose PiPrecision
- 6+ yrs Export Experience
- 24h CAD Quote Review
- 1 piece Minimum Order
- 2 weeks Production Lead Time
Need Surface Finishing Service?
Initial review is targeted within 24 hours for a complete RFQ. Orders from one prototype are supported.
Request QuoteSurface Finishing Service FAQs
Process-specific answers from the PiPrecision Engineering and Quality teams.
How should I choose a surface finish for a machined part?
Start with function: substrate and condition, corrosion environment, wear, friction, electrical conductivity or insulation, chemical and temperature exposure, appearance, and regulatory needs. Then specify the process and governing standard, coating class or thickness, color standard, gloss or texture, sealing or post-treatment, masking, contact points, and inspection or test method. Finish names alone are not complete specifications; PiPrecision reviews compatibility, dimensional allowance, cosmetic limits, and supply-chain availability before commitment.
Answer owner: PiPrecision Engineering Team
Will anodizing, plating, or powder coating change dimensions?
Yes. Plating and powder coating generally add measurable material, while anodizing consumes some aluminum and builds some coating above the original surface; stripping, blasting, polishing, and etching may remove or alter the substrate. Nominal coating thickness does not always equal dimensional growth on a diameter or across two coated faces. Identify dimensions that apply before and after finish, coating thickness and tolerance, masking, thread-gauge state, and inspection stage so machining allowance and acceptance can be planned.
Answer owner: PiPrecision Engineering Team
Can finish color and texture be matched between production batches?
A process can be controlled to an agreed reference, but an exact visual match is not normally guaranteed without defined acceptance criteria. Alloy and temper, lot, machining marks, blast media, surface preparation, geometry, rack location, coating thickness, dye or powder lot, sealing, gloss, texture, and lighting can all change appearance. For cosmetic work, provide an approved physical limit sample or defined color and gloss standard, identify cosmetic surfaces, and agree viewing conditions, defect limits, lot-to-lot expectations, and any instrumental color tolerance before production.
Answer owner: PiPrecision Quality Team
Can selected areas be masked or laser marked after finishing?
Masking and post-finish marking can be reviewed, but feasibility depends on geometry, process temperature and chemistry, required edge quality, and contact or rack locations. Define masked threads, bores, grounding points, sealing faces, cosmetic zones, and allowed witness marks on the drawing. For laser marking, provide controlled artwork or text, location, orientation, size, contrast, serialization rules, machine-readable-code grade if applicable, and permanence or qualification requirements.
Answer owner: PiPrecision Engineering Team