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topic 29075

Etching in anodizing



2004

Is etching necessary for anodizing castings. The castings are chemically washed before it goes for anodizing. Need this for deciding my process sequence for my new plant

Thickness: 20 microns
Hardness : 340 Vickers

S.Jabasingh Immanuel
Anodizing shop - Chennai, Tamilnadu, India


2004

Gm,

Etching in Chromic / Sulphuric is required prior to Anodising to remove and even out surface imperfections even though alkaline degreasing to some extent etches the surface of Aluminium. Also, a Dip in chromic/sulphuric bath will help in removing the smut formed on the surface during Alkaline Degreasing.

Shankaranarayanan N
- Bangalore, Karnataka, India

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