Process of producing phosphate coatings on metals

Details Process of producing phosphate coatings on metals Process of producing phosphate coatings on metals

1987-10-20

1989-04-25

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148262, 148263, C23C 2217, C23C 2286

Patent

active

048244902

ABSTRACT:
Disclosed is a process of producing a phosphate coating on a metal having a surface which consists at least in part of iron or steel. The metal is contacted at a temperature in the range from 30.degree. to 50.degree. C. with a phosphatizing solution which contains 5 to 25 g/l zinc, 1 to 10 g/l manganese, 0.1 to 13 g/l iron(II), 5 to 40 g/l phosphate (calculated as P.sub.2 O.sub.5), 5 to 50 g/l nitrate, and which also contains 0.5 to 5 g/l fluoroborate (calculated as BF.sub.4), and 0.05 to 3 g/l tartaric acid and/or citric acid. The solution has been adjusted to weight ratios of Zn:P.sub.2 O.sub.5 =(0.5 to 3):1 and of Mn:Zn=(0.04 to 0.5):1 and to a ratio of free acid to total acid of (0.04 to 0.2):1.
It is preferred to add nickel, copper and/or calcium to the phosphatizing solution and to adjust it to a content of Fe(II) not in excess of 10 g/l. The process is particularly suitable for preparing metals for cold working.

REFERENCES:
patent: 2479564 (1949-08-01), Gilbert
patent: 2850418 (1958-09-01), Otto
patent: 3166444 (1965-01-01), Ehren
patent: 3338755 (1967-08-01), Jenkins
patent: 3860455 (1975-01-01), Hansen et al.

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