Anodizing of Aluminum

2Al + 3H2O → Al2O3 + 6H+ + 6e−

Übersicht

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.

Teilnehmer

Rolle Substanz Koeffizient Zustand
Reaktant Aluminum Al 2 (s)
Reaktant Water H₂O 3 (l)
Produkt Aluminum Oxide Al₂O₃ 1 (s)

Alltägliches Beispiel

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

Industrielle Bedeutung

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

Eigenschaften

Typ
Electrochemical
Reversibel
Nein
Energie
Endotherm
ΔH
871,0 kJ/mol

Verwandte Reaktionen

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.