鋁的特性
陽極定義
Anodizing is the successful development and control of a natural oxidation process that occurs when alumlinum is exposed to the atmosphere. Electricity and chemicals are used jointly to produce a hard . transparent surface that is integral base Aluminum.
特性
- 堅硬,如藍寶石
- 透明,接近玻璃
- 絕緣,防靜電
- 顏色外觀多變
- 與鋁表面完全結合且不碎裂
Physical property of Aluminum anodizing
| 陽極孔密度 | 6x1010/cm2 |
|---|---|
| 熱傳導係數 | 0.16cal/cm.sec.°C |
| 熱阻 | 12-13mΩ-cm |
| 耐電壓 | 400V |
| 膜厚 | 5〜20μm(normal) 30〜100μm(hard anodizing) |
| 孔隙率 | 20〜30% |
| 硬度 | 200〜250Hv(normal), 400〜450Hv(hard anodizing) |
| 密度 | 3.18g/cm3(20°C) |
| 耐熱溫度 | 300°C |
| 熱膨脹係數 | 4.5x10-6M/°C |
陽極應用
- 增加耐蝕性
- 增加耐磨耗性
- 改善底材與塗膜之密著
- 提供絕緣表面
- 隔熱
- 保護拋光及機械加工過的表面
- 改善外觀
陽極處理
Pretreatment：The Aluminum surface is first cleaned chemically treated. Etching results in a satin matte appearance.
Anodizing：Once the surface is prepared, the anodic film is built.
Post Treatment：The porous anodic film can be colored in this stage.
Sealing：Many of the colors are fade-resistant. Sealing the anodic film normally consists of a hot water bath basically swells the pores shut.
Surface Preparatiion
- Mechanical Polish
- Scrubbing
- Sandblasting
- Chemical Polish
- Etching
陽極種類
- 透明皮膜,對染料的接受力最佳,適用於一般裝飾陽極.
- 乳白色皮膜,適用於特殊合金陽極處理.
- 黃至灰色皮膜,染色色彩侷限於深色,適用於硬質陽極.
