How each finish works
Anodizing grows an aluminum oxide layer electrochemically — it is integrated with the surface, hard and thin (typically 5–25 µm). Powder coating applies an electrostatically sprayed polymer film that is cured into a tough, continuous layer (typically 60–120 µm).
Appearance and durability
Anodized finishes have a metallic, translucent character with excellent wear and UV stability; color options are more limited and some variation between lots is inherent. Powder coating offers virtually unlimited RAL colors and textures, hides surface imperfections, and provides excellent impact and chemical resistance.
- Anodizing — thin, hard, metallic, integrated with the surface
- Powder coating — thicker, color-rich, impact resistant, hides imperfections
- Marine or harsh environments: spec high-performance powder systems or thicker anodic layers
- Visible architectural surfaces: agree a master sample or color standard
Tolerances and fit
Both finishes add thickness. Anodizing grows roughly symmetrically — about half the layer thickness on each dimension. Powder coating adds a thicker film that can affect fit on tight features. Specify fit-critical dimensions in the finished state.
Specifying the finish in an RFQ
State the finish type, color reference (RAL or sample), thickness/quality class, visible surfaces and any masking. 'Silver, nice quality' cannot be quoted consistently; 'anodized clear, 15 µm min, visible faces A and B' can.