Anodizing of Aluminum
2Al + 3H2O → Al2O3 + 6H+ + 6e−
Обзор
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.
Участники
| Роль | Вещество | Коэффициент | Состояние |
|---|---|---|---|
| Реагент | Aluminum Al | 2 | (s) |
| Реагент | Water H₂O | 3 | (l) |
| Продукт | Aluminum Oxide Al₂O₃ | 1 | (s) |
Пример из жизни
Apple MacBooks, iPhones, and many premium electronics use anodized aluminum for the durable, colored finish.
Промышленное значение
Anodizing is used in aerospace, architecture, automotive, and consumer electronics. The market exceeds $4 billion annually.
Свойства
- Тип
- Electrochemical
- Обратимая
- Нет
- Энергия
- Эндотермическая
- ΔH
- 871,0 kJ/mol
Связанные реакции
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.