Formation of nickel phosphate coatings on iron or steel

Details Formation of nickel phosphate coatings on iron or steel Formation of nickel phosphate coatings on iron or steel

C - Chemistry, Metallurgy

23

C

148/17

C23C 22/78 (2006.01) C23C 22/08 (2006.01)

Patent

CA 1059881

ABSTRACT OF THE DISCLOSURE The disclosure describes an aqueous composition which is useful for forming a phosphate coating on an iron or steel surface. The composition comprises 1-10 g/l of a hydroxy carboxylic acid, 3-50 g/l of phosphate (as P2O5) and 2-6 g/l of nickel ion. The composition has a Total Acid value of 10-50 points and a Free Acid value of 1-5 points. Process of forming a protective coating on an iron or steel surface using this composition. This coating is suitable as an undercoating for painting, as a solid lubricant for cold working or as an undercoating for ceramic or porcelain enameled ironwork.

237048

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