Anodizing of Aluminum
2Al + 3H2O → Al2O3 + 6H+ + 6e−
概要
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.
参加者
| 役割 | 物質 | 係数 | 状態 |
|---|---|---|---|
| 反応物 | Aluminum Al | 2 | (s) |
| 反応物 | Water H₂O | 3 | (l) |
| 生成物 | Aluminum Oxide Al₂O₃ | 1 | (s) |
日常の例
Apple MacBooks, iPhones, and many premium electronics use anodized aluminum for the durable, colored finish.
産業上の重要性
陽極酸化処理は航空宇宙、建築、自動車、家電製品に使用されています。市場規模は年間40億ドルを超えています。
特性
- タイプ
- Electrochemical
- 可逆的
- いいえ
- エネルギー
- 吸熱性
- ΔH
- 871.0 kJ/mol
関連する反応
Electrorefining of Copper
Alkaline Battery Discharge
Chlor-Alkali Electrolysis
Nickel-Metal Hydride Battery
Daniell Cell (Zinc-Copper Galvanic Cell)
Electrolysis of Molten NaCl (Downs Process)
Lead-Acid Battery Discharge
Hall-Héroult Process (Aluminum Smelting)
Electrowinning of Zinc
Electrolysis of Water
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.