Method For Coating Metallic Surfaces With An Aqueous Composition
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Abstract
The invention relates to a process for coating metallic surfaces with a composition containing silane/silanol/siloxane/polysiloxane, the composition containing the following in addition to water and optionally in addition to at least one organic solvent and/or at least one substance that influences the pH: at least one compound a) selected from silanes, silanols, siloxanes and polysiloxanes, at least one of these compounds still being capable of condensation, and optionally also at least one compound b) containing titanium, hafnium, zirconium, aluminium and/or boron, at least one type of cation c) and/or at least one organic compound d) selected from monomers, oligomers, polymers, copolymers and block copolymers, wherein the coating freshly applied with this composition is rinsed with a fluid and is not dried thoroughly before this rinsing step so that the at least one compound a) capable of condensation does not condense substantially before the rinsing step. As an alternative or in addition, the process can also be carried out in such a way that the coating freshly applied with this composition is not dried thoroughly before the application of a subsequent coating so that the at least one compound a) capable of condensation does not condense substantially before the application of the subsequent coating.
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Citations
16 Claims
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1-7. -7. (canceled)
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8. A process comprising contacting a metallic surface with a first composition comprising
water, at least one compound a) capable of condensation selected from the group consisting of a silane, a silanol, a siloxane and a polysiloxane, wherein the at least one compound still being capable of condensation, at least one compound b) selected from the group consisting of titanium, hafnium, zirconium, aluminum and boron; -
at least one cation c) selected from a cation of a metal of subgroup 1 to 3 and 5 to 8, including a lanthanide, and of main group 2 of the periodic table of the elements;
at least one organic compound d) selected from the group consisting of a monomer, an oligomer, a polymer, a copolymer and a block copolymer;
wherein the first coating is not dried so that the at least one compound a) capable of condensation does not condense substantially before the rinsing step. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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Specification