| abstract |
The present invention relates to an aqueous composition for pretreating the metal surface before treating the metal surface or applying further coating. Aqueous compositions of the invention are obtained by a) adding at least sodium, potassium, and / or ammonium water glass, and b) one or more silanes to water, in each case comprising the reaction product produced therefrom, a) The amount ratio of b) is preferably in the range of 0.1: 1 to 2: 1. |