1186Conversion Coatings

These coatings operate by chemical conversion of the metal surface. There are three main types:

1. Phosphate coatings—applied primarily to steel surfaces as a base for paint topcoats.

2. Chromate coatings—applied to aluminum, magnesium, and zinc-based alloys, providing an excellent base for subsequent paint overcoats.

3. Anodizing, this is, an electrolytic process whereby the oxide layer of a metal/alloy, notably aluminum, is increased in thickness providing some additional degree of protection but also providing an excellent base for paint overcoats.

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