Anodizing of Aluminum

2Al + 3H2O → Al2O3 + 6H+ + 6e−

Aperçu

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.

Participants

Rôle Substance Coefficient État
Réactif Aluminum Al 2 (s)
Réactif Water H₂O 3 (l)
Produit Aluminum Oxide Al₂O₃ 1 (s)

Exemple du quotidien

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

Importance industrielle

Anodizing is used in aerospace, architecture, automotive, and consumer electronics. The market exceeds $4 billion annually.

Propriétés

Type
Electrochemical
Réversible
Non
Énergie
Endothermique
ΔH
871,0 kJ/mol

Réactions associées

Electrolysis of Water Electrolytic Production of Chlorate Electrorefining of Copper Alkaline Battery Discharge Cathodic Protection (Zinc Sacrificial Anode) Chlor-Alkali Electrolysis Chrome Electroplating Nickel-Metal Hydride Battery Sodium-Sulfur Battery Electrochemical CO₂ Reduction to CO

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.