Anodizing of Aluminum

2Al + 3H2O → Al2O3 + 6H+ + 6e−

Descripción general

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

Rol Sustancia Coeficiente Estado
Reactivo Aluminum Al 2 (s)
Reactivo Water H₂O 3 (l)
Producto Aluminum Oxide Al₂O₃ 1 (s)

Ejemplo cotidiano

Apple MacBooks, iPhones, and many premium electronics use anodized aluminum for the durable, colored finish.

Importancia industrial

El anodizado se utiliza en aeroespacial, arquitectura, automoción y electrónica de consumo. El mercado supera los 4.000 millones de dólares anuales.

Propiedades

Tipo
Electrochemical
Reversible
No
Energía
Endotérmico
ΔH
871,0 kJ/mol

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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.