| abstract |
The invention relates to a process for coating metallic surfaces with a composition containing silane/silanol/siloxane/polysiloxane, the composition consisting essentially ofn a) at least one compound selected from silanes, silanols, siloxanes and polysiloxanes, b) at least two compounds selected from compounds containing titanium, hafnium, zirconium, aluminium and/or boron, and optionally c) at least one type of cation selected from cations of metals of subgroups 1 to 3 and 5 to 8, including lanthanides, and of main group 2 of the periodic table of the elements, and/or at least one corresponding compound, d) at least one organic compound selected from monomers, oligomers, polymers, copolymers and block copolymers, and/or e) at least one substance that influences the pH, as well as f) water, and g) optionally at least one organic solvent. nn The invention further relates to corresponding aqueous compositions. |