| abstract |
The invention relates to a method of immobilizing metal surfaces, in particular metal strips, comprising surface treatment in alternating layers consisting of: a) an acidic, aqueous preparation containing at least one water-soluble acid group-containing copolymer (A) and b) an aqueous formulation containing at least one species (B), preferably a cationic and / or a cationic polymer (B1), which is water-soluble and / or water-dispersible and has a cationic and / The formulation a) is always the first and last layer. |