Process and aqueous compositions for treating metal surfaces

Details Process and aqueous compositions for treating metal surfaces Process and aqueous compositions for treating metal surfaces

C - Chemistry, Metallurgy

09

D

148/16

C09D 5/12 (2006.01) C23C 22/00 (2006.01) C23C 22/34 (2006.01) C23C 22/36 (2006.01)

Patent

CA 1219790

ABSTRACT OF THE DISCLOSURE The invention relates to a process for treating metal surfaces, preferably of aluminum, aluminum alloys and steel, for the subsequent application of organic coating composi- tions. The metal surfaces are wetted with an aqueous bath solution containing chromium(III)ions, fluoride ions and an organic film former which is soluble or homogeneously dis- persible in water, after which the solution applied is dried and converted by heating into a water-insoluble film. The bath solution preferably contains the following con- stituents and approximate quantities thereof: 0.5 to 10 g/l of chromium(III)ions, 0.55 to 11 g/l of fluoride ions, 0.6 to 12.5 g/l of phosphate ions, and 0.1.5 to 5.0 g/l of organic film former. The organic film former preferably used is a polymer containing free carboxyl groups, more preferably a homopolymer and/or copolymer of acrylic and/or methacrylic acid.

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