Anodizing of Aluminum

2Al + 3H₂O → Al₂O₃ + 6H⁺ + 6e⁻

Tổng quan

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.

Người tham gia

Vai trò	Chất	Hệ số	Trạng thái
Chất phản ứng	Aluminum Al	2	(s)
Chất phản ứng	Water H₂O	3	(l)
Sản phẩm	Aluminum Oxide Al₂O₃	1	(s)

Ví dụ thực tế

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

Tầm quan trọng công nghiệp

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

Tính chất

Loại: Electrochemical
Thuận nghịch: Không
Năng lượng: Thu nhiệt
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.