Process and composition for phosphating metal surfaces

Details Process and composition for phosphating metal surfaces Process and composition for phosphating metal surfaces

C - Chemistry, Metallurgy

23

C

148/19

C23C 22/13 (2006.01) C23C 22/14 (2006.01)

Patent

CA 1206852

ABSTRACT OF THE DISCLOSURE In a process for applying phosphate coatings to metal surfaces by means of nitrite-accelerated phosphating solutions based on zinc phosphate, the layer weight on iron or steel is reduced and controlled by bringing the metal surfaces in contact with a phosphating solution which addi- tionally contains a nitrobenzenesulfonate and in which the nitrobenzenesulfonate content is such that the weight of the resulting layer is less than 2 g/m2, preferably less than 1.5 g/m . The content of nitrobenzenesulfonate is greater than 100 mg/liter and that of nitrite should preferably be 10 to 300 mg/liter. The process according to the invention is applicable both to low zinc and high zinc phosphating solutions.

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