Method and solution for coating metal surfaces with a posphating solution containing water peroxide, produced metal object and use of said object

摘要

The invention relates to a method for the treatment or pre-treatment of surfaces of metal objects by means of an acidic, aqueous solution containing zinc and phosphate. Said invention is characterised in that the phosphating solution contains between 0.1-10 g/L zinc, 4-50 g/L phosphate calculated as PO₄, between 0.03-3 g/L of at least one guanidine compound comprising at least one nitro group calculated as nitroguanidine, and between 0.001-0.9 g/L hydrogen peroxide and has a temperature of less than 80° C. The invention also relates to a corresponding acidic, aqueous composition.