Method for coating metallic surfaces with an aqueous composition
AssigneeChemetall GmbH
InventorsThomas Kolberg, Manfred Walter, Peter Schubach
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Abstract
The invention relates to a process for coating metallic surfaces with a composition containing at least one of a silane, silanol, siloxane or polysiloxane that is capable of condensation, water and optionally an organic solvent. The composition also contains compound containing Ti, Hf, Zr, Al or B; and at least one type of cation or an organic compound d) selected from monomers, oligomers, polymers, copolymers and block copolymers. The coating freshly applied with this composition is rinsed with a fluid and is not dried thoroughly before this rinsing step so that the compound capable of condensation does not condense substantially before the rinsing step.
Claims9
A process for forming a silane pretreatment layer, the process comprising
- contacting a metallic surface with a first composition to form a first coating, wherein said first composition comprises:
- water, and
- a) a compound capable of condensation selected from the group consisting of a silane, a silanol, a siloxane and a polysiloxane, and at least one of
- b) a compound containing titanium, hafnium, zirconium, aluminum or boron, or
- c) a cation selected from a metal of subgroup 1 to 3 and 5 to 8, which subgroups include the lanthanides, and of main group 2 of the periodic table of the elements;
- and
- d) a hydrophobicity adjusting agent;
- and
- rinsing the first coating while it is wet with an aqueous surfactant composition to form the silane pretreatment layer.
Dependencies are inferred from the claim text.