Anodizing: An Introduction


Anodizing is a surface treatment process that uses electrochemistry to form a layer of Al2O3 (aluminum oxide) on aluminum and aluminum alloy surfaces. A metal’s surface state and performance can be changed by anodic oxidation, which improves corrosion resistance, increases wear resistance, and protects the metal’s surface.

This method is widely used in mechanical parts, aircraft and automobile parts, precision instruments and radio equipment, daily necessities and architectural decoration for non-ferrous metals or their alloys.

Anodizing Information

FeaturesType II AnodizingType III Anodizing
ColorClear, black, blue, gold, grey, red, etc.Clear, black
TextureMatte finish with a smooth texture.Matte finish with a smooth texture.
ThicknessThe range is 1.8 mm to 25 mm (0.00007″).The value is greater than 0.001″
ApplicationsComponents for aircraft, architectural parts, kitchenware, consumer goodsTemperature-sensitive, chemically exposed, or worn parts

Anodizing of Design

Tolerances and Surface Finishes