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Phosphate pre-treatment is the most commonly overlooked step in preparation for coating. The generic term phosphating is a process where an acid attacks the metal of the work piece and re-deposits a material that is a combination of the metal substrate (and other metals-like zinc) along with phosphate.
1. Field of the Invention. This invention relates to zinc phosphate coatings for metal surfaces and a process for phosphatizing a metal surface with acidic aqueous phosphate solution. The invention is applicable to a variety of substrates including cold rolled steel (CRS), zinc alloys and aluminum.2.atents. Zinc phosphate coatings for metal surfaces and phosphating process. Concentrates containing (a) hydroxylamine sulfate and (b) zinc, nickel, manganese and phosphate ions are formulated into aqueous coating solutions for treating metal surfaces, including ferrous, zinc and aluminum surfaces....