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Chromating and machining pressure die casted aluminium

after chromating the die casted aluminium is it ok to machine the part. does the surface hardness of the material increases after chromating.

Mahendran Chinnasamy
Machine shop employee - Pondicherry, India
November 16, 2009

November 17, 2009

Hi

Chromating is a chemical conversion, so that is what happens. The surface is changed from having a natural oxide film to have a chromate aluminum oxide film. This film is very thin and has no influence of the hardness of the surface.

Machining after chromating the surface will remove the chromate aluminum oxide film.

Sunny regards
Anne

Anne Deacon Juhl
- - Trustrup Denmark

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