Anodizing

Anodizing has insulative properties, so anodized parts have poor electrical conductivity.

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Anodizing is a surface treatment process that uses electrochemistry to form a layer of Al2O3 (aluminum oxide) film on the surface of aluminum and aluminum alloy. Through anodic oxidation, the surface state and performance of the material can be changed, thus improving corrosion resistance, enhancing wear resistance and hardness, and protecting the metal surface.

Non-ferrous metals or their alloys (such as aluminum, magnesium and their alloys) can be anodized. This method is widely used in mechanical parts, aircraft and automobile parts, precision instruments and radio equipment, daily necessities and architectural decoration.

Anodizing Features

Anodizing features symbol

Features


Materials
Aluminum

Color
Clear, black, grey, red, blue, gold.

Texture
Smooth, matte finish.

Thickness
1.8 μm to 25 μm (0.00007")

Anodizing Subtypes

Type II Anodizing


Material
Aluminum
Color
Clear, black, blue, gold, grey, red, etc.
Thickness
1.8 μm to 25 μm (0.00007″)
Applications
Consumer goods, aircraft components, architectural parts, kitchenware

Type III Anodizing


Material
Aluminum
Color
Clear, black
Applications
Parts subject to high and low temperatures, chemical exposure, or wear
Thickness
> 0.001″

Material Applicable

Metals

Description
Price
Aluminum
High strength-to-weight ratio
$

Description
Price

Design Considerations

  • Anodizing has insulative properties, so anodized parts have poor electrical conductivity.
  • All edges and corners on the workpiece should be rounded with a radius of no less than 0.5 mm, and no burrs are allowed. This prevents local overheating and burning of the workpiece caused by current concentration.
  • Workpieces with rough surfaces can become smoother after hard anodic oxidation treatment. However, workpieces already possessing an extremely smooth finish will lose some smoothness.
  • In the process of hard anodizing, the workpiece must bear high voltage and current. Special fixtures must, therefore, be designed to keep the workpiece in good conductive contact. It will otherwise break down or burn the contact parts of the workpiece.
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