Pretreatment of tinplate before painting

The present invention relates to a process for the anticorrosion treatment of tinplate, an anti-corrosive paint primer is applied in which, in a single process step, which causes upon contact of the foods with a topcoat provided according to the invention pre-treated tinplate with liquids that release sulfur compounds or containing and protein-containing black discoloration of the shiny metallic surface of the pretreated tinplate can be effectively suppressed. In the inventive method, the tinplate is polarized anodically in an electrolyte containing silicates of the composition M According to the invention pre-treated tinplate may be used in particular for the production of food-grade packaging such as beverage or food cans.