Anodizing of Aluminum
2Al + 3H2O → Al2O3 + 6H+ + 6e−
Tổng quan
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.
Người tham gia
| Vai trò | Chất | Hệ số | Trạng thái |
|---|---|---|---|
| Chất phản ứng | Aluminum Al | 2 | (s) |
| Chất phản ứng | Water H₂O | 3 | (l) |
| Sản phẩm | Aluminum Oxide Al₂O₃ | 1 | (s) |
Ví dụ thực tế
Apple MacBooks, iPhones, and many premium electronics use anodized aluminum for the durable, colored finish.
Tầm quan trọng công nghiệp
Anodizing is used in aerospace, architecture, automotive, and consumer electronics. The market exceeds $4 billion annually.
Tính chất
- Loại
- Electrochemical
- Thuận nghịch
- Không
- Năng lượng
- Thu nhiệt
- ΔH
- 871,0 kJ/mol
Phản ứng liên quan
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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.