Process of producing phosphate coatings on metals

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

C - Chemistry, Metallurgy

23

C

C23C 22/13 (2006.01)

Patent

CA 2149721

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, a phosphatizing solution for use in the process and a concentrate for forming and/or replenishing the solution. The metal is contacted at a temperature in the range from 30 to 65°C with a phosphatizing solution which contains about 5 to about 25 g/l zinc, about .5 to about 5 g/l of magnesium, about 0.1 to about 13 g/l iron(II), about 5 to about 40 g/l phosphate (calculated as P2O5), about 5 to about 50 g/l nitrate, and about 0.5 to about 5 g/l fluoroborate (calculated as BF4). The solution has been adjusted to weight ratios of Zn : P2O5 = (0.5 to 3) : 1 and of Mg : Zn = (0.04 to 0.5) : 1 and to a ratio of free acid to total acid of (0.04 to 0.2) : 1. The process is particularly suitable for preparing metals for cold working.

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