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
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.