초록 ▼

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 i

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.

대표청구항 ▼

A process for phosphatizing metal surfaces which comprises forming a phosphate coating on the metal surface by contacting the metal surface with an aqueous acidic zinc phosphate solution containing an oxidizing agent, which zinc phosphate solution contains: from about 0.4 to 1.5 g/liter of Zn, from

A process for phosphatizing metal surfaces which comprises forming a phosphate coating on the metal surface by contacting the metal surface with an aqueous acidic zinc phosphate solution containing an oxidizing agent, which zinc phosphate solution contains: from about 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 from about 0.012 to 0.12:1 and the weight ratio of Ni to Zn is from about 0 to 1.5:1 and, thereafter, replenishing the said zinc phosphate solution with a replenishing solution in which the weight ratio of Zn:Ni:P2O5 is from about 0.18 to 0.33:0 to 0.06:1. The process as claimed in claim 1, 2, 5, 3, or 4 in which, following the formation of the phosphate coating on the metal surfaces treated, an electrophoretic coating is applied to said treated surfaces.