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

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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.