método para a passivação de uma superfície metálica, e, camada de passivação sobre uma superfície metálica

摘要

The invention relates to a method for passivating metal surfaces, in particular strip metals, by treating the surface in alternating layers with a) an acidic aqueous preparation containing at least one water-soluble acid group-containing copolymer (A) and b) an aqueous preparation containing at least one species (B) which is soluble and/or dispersible in water and which has cationic and/or procationic groups, preferably a cationic and/or procationic polymer (B1), said preparation a) always being the first and the last layer.