Process of producing phosphate coatings

Details Process of producing phosphate coatings Process of producing phosphate coatings

1993-12-13

1995-01-24

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148261, C23C 2210, C23C 2222, C23C 216

Patent

active

053839820

ABSTRACT:
A process of producing a phosphate coating on a metal surface of iron or steel by contacting the surface with an aqueous phosphating solution on the basis of magnesium phosphate. The solution contains 0.2 to 4 g/l magnesium, 1 to 20 g/l phosphate (calculated as P.sub.2 O.sub.5) and a peroxide compound as an accelerator. The phosphating solution is free of inorganic substances which are not precipitable with calcium hydroxide in a neutral or alkaline medium. It is preferred to use phosphating solutions which also contain activators, which are precipitable with calcium hydroxide in a neutral or alkaline medium.

REFERENCES:
patent: 5268041 (1993-12-01), Gehmecker et al.

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