Anodizing of Aluminum
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2Al + 3H2O → Al2O3 + 6H+ + 6e−
概述
Anodizing grows a thick, porous aluminum oxide layer on aluminum surfaces by making the aluminum the anode in an acid electrolyte (typically 15–20% H₂SO₄). The oxide layer (5–25 μm for decorative, up to 150 μm for hard anodizing) provides corrosion resistance, wear resistance, and can absorb dyes for coloring.
参与者
| 角色 | 物质 | 系数 | 状态 |
|---|---|---|---|
| 反应物 | Aluminum Al | 2 | (s) |
| 反应物 | Water H₂O | 3 | (l) |
| 产物 | Aluminum Oxide Al₂O₃ | 1 | (s) |
日常示例
Apple MacBooks, iPhones, and many premium electronics use anodized aluminum for the durable, colored finish.
工业重要性
阳极氧化应用于航空航天、建筑、汽车和消费电子领域,市场规模每年超过40亿美元。
属性
- 可逆
- 否
- 能量
- 吸热
- ΔH
- 871.0 kJ/mol
Frequently Asked Questions
What is the equation for Anodizing of Aluminum?
The balanced equation is: 2Al + 3H₂O → Al₂O₃ + 6H⁺ + 6e⁻.
What type of reaction is Anodizing of Aluminum?
Anodizing of Aluminum is a electrochemical reaction.
Is Anodizing of Aluminum exothermic or endothermic?
Anodizing of Aluminum is endothermic (absorbs energy). The enthalpy change (ΔH) is 871.0 kJ/mol.