pretreatment1General Metal Finishing is using the iron phosphate pretreatment. Iron phosphate conversion coating is a very important pretreatment process, adding significantly to the performance of the finish coating. A phosphate coating converts the metal substrate to a uniform, inert surface, which improves bonding, minimizes the spread of oxidation if the coating is scratched and improves the over-all resistance of the component. Parts are subjected to an acidic bath and a chemical conversion forms in a complete film on the part of the surface, changing the chemical and physical nature of the metal surface.

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