| 摘要 |
The invention relates to a method for coating a metallic surface with an aqueous composition, which contains, if necessary, an organic solvent as well as other constituents, for pretreating before applying another coating or for treating said metallic surface. The method is characterized in that the composition contains, in addition to water: a) at least one hydrolyzable and/or at least partially hydrolyzed fluorine-free silane, and; b) at least one hydrolyzable and/or at least partially hydrolyzed fluorine-containing silane. The silanes are water-soluble in the composition or are water-soluble, in particular, due to (additional) hydrolysis reactions and/or chemical reactions before application to the metallic surface. The invention also relates to corresponding compositions.
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