An aqueous composition for pretreating a metallic surface prior to further coating or treating that surface

摘要

The present invention relates to an aqueous composition for pretreating a metallic surface before a further coating or for treating those surfaces, the aqueous composition being obtained by adding a) at least sodium, potassium and / or ammonium water glass to water and b) at least a silane can be added, the quantitative ratio of a) to b), including the resulting reaction products, preferably in the range from 0.1: 1 to 2: 1.