Anodising

Anodising

Secondary Finishing

Common Anodising Thickness Ranges

The thickness of anodising that you should use depends on the part environment and application. The corrosion resistance and long term performance of the anodising depends on two things:

  1. Sealing
  2. Anodising Thickness

The most important factor in the corrosion resistance of anodising is sealing, not thickness. Even thin coating have good corrosion resistant properties when sealed. The difficulty comes evaluating the quality of sealing without damaging the part, it is important to have a reputable anodising service provider which has implemented rigorous process controls which include periodic salt spray testing. Sealing is important for dye colour retention.

Finish Recommended Thickness
Sulphuric Anodising, Undyed
Type II
8 to 13µm or 5 to 15µm
Sulphuric Anodising, Dyed
Type II
8 to 25µm or 5 to 25µm
Hard Anodising, Cosmetic Dyed
25 to 40µm
Hard Anodising, General/Dyed
Type III
40 to 60µm
Hard Anodising, Wear Resistance
Type III
40 to 60µm
Chromium Anodising
Type I
Subject to other Controls
Thin film Sulphuric Anodising
Type IC or Type IIB
Subject to other Controls

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