An overview on the stability of phosphate coating as a base for electropaints, suggests a phosphophyllite-rich coating to provide the best resistance to environments occurring during cathodic electrophoretic painting, curing and under service conditions. But coatings on galvanized and other coated steels showed formation of hopeite on phosphating which is unsuitable for protection of the steel substrate. An incorporation of metallic ions, such as nickel and manganese into the zinc phosphating bath, seems to provide a satisfactory ...
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