Views: 33361 Author: Site Editor Publish Time: 2026-09-04 Origin: Site
Core essence: Colored anodizing grows inorganic aluminum-oxide film in-situ on aluminum substrate, then dyed with organic dye or metallic salt. Colored electrophoretic coating firstly completes anodizing for precision CNC-machined components, then deposits an extra layer of colored organic resin on top, forming composite film, widely used for custom CNC parts from precision machining manufacturer.
Degreasing → Polishing / Sandblasting → Anodizing to form porous aluminum-oxide film → Dyeing (organic dye / electrolytic metallic salt) → Sealing → Drying
Colorant penetrates micropores inside oxide film; no additional resin coating is added, very popular for aluminum CNC machining projects with strict dimension tolerance requirements.
Degreasing → Anodizing → Coloring (pre-dye during anodizing or use pre-colored electrophoretic paint) → Electrophoretic organic resin deposition → Water washing → High-temperature baking & curing
Base layer is aluminum oxide film, outer surface is colored organic resin film with double-layer structure. It is a preferred surface finish solution for high-volume CNC machining services facing harsh coastal outdoor environment.
Item | Colored Anodizing | Colored Electrophoretic Coating |
Film Structure | Single-layer inorganic aluminum-oxide film, film thickness 5-25μm | Composite film: anodized layer + colored resin film, total thickness 16-30μm |
Surface Hardness | High HV300-500, wear-resistant, suitable for sliding friction surfaces; brittle film, easy to crack under heavy impact | Resin layer hardness 2-3H, good toughness and anti-impact performance; wear resistance inferior to anodizing, not fit for frequent friction positions |
Appearance Texture | Strong metallic texture, retains drawing / sandblast texture; relatively low color saturation, mainly matte finish, no glossy paint-layer feeling | High-saturation color, rich gloss (high-gloss / matte / ceramic electrophoresis); paint-layer visual effect weakens metallic texture |
Corrosion Resistance | Good performance, depends on sealing quality; poor alkali resistance, prone to white spots in coastal outdoor scenarios | Superior corrosion resistance. Resin isolates moisture and salt spray, higher salt-spray rating than ordinary anodizing, perfect for outdoor applications |
Weather-Resistance / Fading Risk | Electrolytic coloring has good outdoor weather resistance; organic dye coloring only for indoor use, easy to fade under sunlight | Colored electrophoretic paint delivers better UV-resistance and anti-yellowing property, stable color for long-term outdoor operation |
Dimension Impact | Film grows bidirectionally from substrate, slight dimension occupation | Thicker total film, larger dimension influence on parts; precise CNC-machined components need reserved machining tolerance |
Post-Processing | Minor bending is acceptable; conversion-type film hardly peels off in large pieces; grinding is forbidden | Surface organic paint will be removed once grinded; paint layer tends to crack after bending |
Cost | Medium cost, flexible for small-batch orders | Higher than standard colored anodizing, extra baking process increases manufacturing cost |
1. Colored Anodizing -Electrolytic coloring: bronze, champagne, gunmetal, great weather-resistance for outdoor use. - Organic dye coloring: bright colors including red, blue, green, purple; only for indoor use, color fades quickly under direct sunlight.
2. Colored Electrophoretic Coating Adopt pre-colored electrophoretic paint instead of relying on oxide-film dyeing. It delivers full-bodied color and excellent high-gloss effect. Even bright colors maintain decent weather-resistance for outdoor-deployed custom CNC parts.
✅ Choose Colored Anodizing: For CNC precision-machined components requiring wear-resistant sliding surface, heat dissipation performance, strong matte metallic texture, indoor application, and zero extra paint-layer thickness allowance.
✅ Choose Colored Electrophoretic Coating: For outdoor or coastal high-salt-fog environment, projects pursuing full-bodied high-gloss color, anti-collision performance, no strict demand for friction-resistant sliding surface.
⚠️ Note: Die-cast aluminum shows low yield rate for both processes; pores may cause color difference and pin-hole defects.
