A method for substantially nickel free phosphating of a metal surface, composition, concentrate, and phosphate coated metal surface.

摘要

The present invention relates to a method for substantially nickel free phosphating of a metal surface, wherein a metal surface, optionally after cleaning and / or activation, is first treated with an acid aqueous phosphate composition which comprises zinc ions. , manganese ions, and phosphate ions, and is optionally washed and / or dried, and is thereafter treated with an aqueous post-wash composition which comprises at least one type of metal ions selected from the group consisting of the ions. molybdenum, copper, silver, gold, palladium, tin, antimony, titanium, zirconium, and hafnium and / or at least one polymer selected from the group consisting of the polymer classes of polyamines, polyethylene amines, polyanilines, polyimines, polyethyleneimines, polythiophenes , and polypyrrols as well as mixtures and copolymers thereof, with both the phosphate composition and the post wash composition being substantially free. Nickel