Chrome Electroplating
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Cr3+ + 3e− → Cr
概要
Chromium plating deposits a thin layer of chromium from a chromic acid or trivalent chromium bath. Decorative chrome is only 0.25–0.5 μm thick over a nickel undercoat, while hard chrome (industrial) is 20–250 μm thick. Chrome provides exceptional hardness (68–72 HRC), corrosion resistance, and a mirror-like finish.
参加者
| 役割 | 物質 | 係数 | 状態 |
|---|---|---|---|
| 生成物 | Chromium Cr | 1 | (s) |
日常の例
The shiny chrome trim on cars, bathroom fixtures, and kitchen appliances is applied by this electroplating process.
産業上の重要性
クロムめっきは自動車トリム、油圧シリンダー、ピストンリング、工業用ローラーに不可欠です。環境規制により六価クロムから三価クロムへの移行が進んでいます。
特性
- タイプ
- Electrochemical
- 可逆的
- はい
- エネルギー
- 発熱性
- ΔH
- -215.0 kJ/mol