Low zinc content, replenishment

Details Low zinc content, replenishment Low zinc content, replenishment

C - Chemistry, Metallurgy

23

C

148/17, 204/97.0

C23C 22/12 (2006.01) C23C 22/36 (2006.01)

Patent

CA 1200470

ABSTRACT OF THE DISCLOSURE A process for the phosphatizing of metals, particularly iron, steel and zinc, in which the metal is contacted with acidic aqueous zinc phosphate solutions, containing an oxidizing agent, which contain from 0.4 to 1.5 g/liter of Zn from 0 to 1.3 g/liter of Ni and from 10 to 26 g/liter of P2O5, and in which the weight ratio of Zn to P2O5 is adjusted to a value of (from 0.012 to 0.12) : 1 and of Ni to Zn to a value of (from 0 to 1.5): 1, and the bath is supplemented with a concentrate, in which Zn, Ni and P2O5 are present in a weight ratio of (from 0.18 to 0.33: (from 0 to 0.06) : 1, so as to obtain satisfactory phosphatizing results over a long period. Preferably, the zinc phosphatizing solutions, which, in addition, may also contain simple or complex fluorides and compounds that reduce the weight of the coat, are applied at a temperature within the range of from 30 to 65°C.

400721

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