| abstract |
A method for treating a molded body having a steel surface having a carbon content of 0 to 2.06 wt% and a chromium content of 0 to <10 wt%, particularly before cold forming, wherein at least one molded body and one are used The aqueous acidic composition forming a conversion layer as a release layer is contacted, and the aqueous acidic composition is added/only added with an addenda consisting essentially of water, 2 to 500 g/L. An oxalic acid calculated as anhydrous oxalic acid, and a) 0.01 to 20 g/L of at least one promoter based on hydrazine calculated as nitroguanidine or/and b) 0.01 to 20 g/L of at least one nitrate and optionally pigments, A surfactant or/and a thickener, wherein the aqueous acidic composition has a pickling removal of 1 to 6 g/m 2 and the dried conversion layer has a layer weight of 1.5 to 15 g/m 2 , which is dried. The ratio of pickling removal to layer weight of the conversion layer is BA: SG is (0.30 to 0.75): 1, and the dried conversion layer forms a firmly adhered coating. |