Phosphate coating composition and method of applying a...

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C - Chemistry, Metallurgy

23

C

148/17

C23C 22/12 (2006.01) C23C 22/18 (2006.01) C23C 22/36 (2006.01)

Patent

CA 1321532

043.069 PHOSPHATE COATING COMPOSITION AND METHOD OF APPLYING A ZINC-NICKEL PHOSPHATE COATING ABSTRACT OF THE INVENTION This invention relates to a method of coating metal surfaces including-zinc-coated steel with zinc and nickel phosphate crystals for the purposes of improving paint adhesion, corrosion resistance, and resistance to alkali solubility. Potassium, sodium, or ammonium ions present as a phosphate salt are combined with zinc ions and nickel or manganese ions in relative proportions to cause the nickel or manganese ions to form a crystalline coating on the surface in combination with the zinc and phosphate.

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