SURFACE FINISHING
Anodizing
Anodizing is the process of developing a layer of aluminum oxide (Al2O3) on the surface of the aluminum and its alloys through the electrolysis process.
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Introduction
Anodizing is the process of developing a layer of aluminum oxide (Al2O3) on the surface of the aluminum and its alloys through the electrolysis process.
After anodizing, the surface becomes super resistive to corrosion and enhances the other mechanical properties of wear resistance and hardness.
The anodizing process easily achieves various colors, such as black, blue, gold, grey, and red. It can maintain a surface roughness not lower than Ra 3.2μm.
It is used in various industries, including automobile, architecture, aerospace, home appliances, etc.
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key properties
| Features | Info |
|---|---|
| Materials | Aluminum |
| Color | Clear, black, grey, red, blue, and gold. |
| Texture | Smooth, matte finish. |
| Thickness | 1.8 μm to 25 μm (0.00007″) |
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Define alloy, coating type and fit-critical build-up together
Anodizing requirements should distinguish decorative from protective intent, identify the aluminum alloy and pretreatment, define color or sealing where relevant, and account for thickness effects on holes, threads, mating faces and cosmetic surfaces.
Engineering data to lock before release
| Substrate data | Aluminum alloy, temper and pretreatment condition |
|---|---|
| Coating definition | Decorative/protective type, color and sealing requirement |
| Dimensional control | Fit-critical holes, threads and masked faces |
| Acceptance method | Coating characteristics, visual criteria and test requirement |
ISO 7599 provides a framework for specifying anodic oxidation coatings; the drawing must still identify the exact part-specific requirements.
