AQUEOUS COMPOSITION FOR PRETREATING A METAL SURFACE BEFORE APPLYING ANOTHER COATING OR FOR TREATING SAID SURFACE.

摘要

The invention relates to an aqueous composition for pretreating a metal surface before applying another coating or for treating said surfaces. The aqueous composition is obtained by adding a) at least natrium, kalium, and/or ammonium water glass and b) at least one silane to water, the quantity ratio of a) to b) preferably ranging from 0.1 : 1 to 2 : 1 including the reaction products produced therefrom in each case.