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

148/17

C23C 22/17 (2006.01) C23C 22/18 (2006.01) C23C 22/36 (2006.01)

Patent

CA 1308629

ABSTRACT OF THE DISCLOSURE: A process of producing phosphate coatings on metals having surfaces which consist at least in part of iron or steel. In the process the metals are contacted with a phosphatizing solution which is at a temperature in the range from 30 to 50° C and contains: to 25 g/1 zinc 1 to 10 g/1 manganese 0.1 to 13 g/1 iron (II) to 40 g/1 phosphate (calculated as P2O5) to 50 g/1 nitrate and which also contains: 0.5 to 5 g/1 fluoroborate (calculated as BF4) 0.05 to 3 g/1 tartaric acid or citric acid and which has been adjusted to weight ratios of Zn: P2O5 = (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. The process is particularly suitable for preparing metals for cold working.

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