Process for phosphating metal surfaces

Details Process for phosphating metal surfaces Process for phosphating metal surfaces

C - Chemistry, Metallurgy

23

C

148/17

C23C 22/13 (2006.01) C23C 22/14 (2006.01) C23C 22/18 (2006.01) C23C 22/73 (2006.01)

Patent

CA 1200739

ABSTRACT OF THE DISCLOSURE A method of phosphating the surfaces of iron-based metals, zinc- based metals, or combinations of such surfaces by dipping the metal surfaces into an acidic aqueous phosphating solution containing from about 0.5 to about 1.5 g/l of zinc ion, from about 5 to about 30 g/l of phosphate ion, from about 0.6 to about 3 g/l of manganese ion, and a conversion coating accelerator. The phosphated metal surfaces are then suitable for electrocoating. The method produces better conversion coatings than are obtainable with conventional dip-treating processes, and the amount of etching of the metal surfaces is only 2/3 to 4/5 that of conventional processes, so that the quantity of chemicals used in the process as well as sludge formation is only from 2/3 to 4/5 that of conventional processes.

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