Applying phosphate coatings to metallic surfaces comprises wetting with an aqueous acidic phosphatizing solution containing zinc ions, manganese ions and phosphate ions, and drying the solution

摘要

Applying phosphate coatings to metallic surfaces comprises wetting with an aqueous acidic phosphatizing solution containing (in g/l) 26-60 zinc ions, 0.5-40 manganese ions and 50-300 phosphate ions (calculated as P 2O 5) and drying the solution, mostly without post-rinsing. Preferred Features: The phosphatizing solution contains (in g/l) 10-60 zinc ions, 0.5-40 manganese ions and 50-300 phosphate ions (calculated as P 2O 5), 0.5-120 peroxidone ions (calculated as H 2O 2) and 0.5-50 polymers, copolymers and/or cross polymers, especially N-containing heterocyclics, preferably vinyl pyrrolidone.