Process for phosphating metal surfaces

摘要

A method of phosphating the surfaces of iron-based metals, zinc-based metals, or combinations of such surfaces by contacting the metal surfaces with an acidic aqueous phosphating solution containing from about 0.1 to about 2.0 g/l of zinc ion, from about 5 to about 30 g/l of phosphate ion, from about 0.2 to about 3 g/l of manganese ion, and a conversion coating accelerator. The phosphated metal surfaces are then suitable for electrocoating.