Anodizing of Aluminum
2Al + 3H2O → Al2O3 + 6H+ + 6e−
Visão geral
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.
Participantes
| Papel | Substância | Coeficiente | Estado |
|---|---|---|---|
| Reagente | Aluminum Al | 2 | (s) |
| Reagente | Water H₂O | 3 | (l) |
| Produto | Aluminum Oxide Al₂O₃ | 1 | (s) |
Exemplo do cotidiano
Apple MacBooks, iPhones, and many premium electronics use anodized aluminum for the durable, colored finish.
Importância industrial
A anodização é utilizada na aeroespacial, arquitetura, automóvel e eletrónica de consumo. O mercado ultrapassa os 4 mil milhões de dólares anuais.
Propriedades
- Tipo
- Electrochemical
- Reversível
- Não
- Energia
- Endotérmico
- ΔH
- 871,0 kJ/mol
Reações relacionadas
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.