| abstract |
An agent and process for the corrosion protection treatment of a metal surface are provided. The metal surface is contacted with a homo- or copolymer of vinylpyrrolidone, the application solution containing n a) 0.02 to 20 g/l phosphoric acid and/or at least one fluoric acid of one or more elements selected from Zr, Ti, Hf and Si or anions thereof, as well as n b) 10 to 49.9 g/l of a homo- or copolymer of vinylpyrrolidone. |