Activating agent for use in phosphating processes

Details Activating agent for use in phosphating processes Activating agent for use in phosphating processes

C - Chemistry, Metallurgy

23

C

148/17, 23/62, 1

C23C 22/80 (2006.01) C01B 25/37 (2006.01) C23G 1/14 (2006.01) F16L 37/084 (2006.01) F16L 37/098 (2006.01) F16L 37/12 (2006.01)

Patent

CA 2040859

The activating agent which is based on titanium(IV) phosphate and intended for use in the activation of metal surfaces before a zinc phosphating treatment contains one or more copper compounds and has a Ti:Cu weight ratio of 1:100 to 60:1 and optionally contains in addition at least one of the components consisting of condensed phosphate, silicate, complexing agent, water-soluble organic polymer, thickening agent, and surfactant. It is used to prepare aqueous activating baths for activating iron, steel, galvanized steel, zinc, alloy-plated steel, aluminum-plated steel and aluminum before a zinc phosphating treatment, which baths contain 0.001 to 0.060 g/l Ti, 0.020 to 1.2 g/l orthophosphate (calculated as P2O5), and 0.001 to 0.1 g/l Cu and so much alkali that the bath has a pH value of 7 to 11, preferably of 7.5 to 10.

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