Aqueous agent and coating method for the anticorrosive treatment of metallic substrates
AssigneeThyssenKrupp Steel Europe AG
InventorsThomas Sondermann, Christoph Strahl, Matthias Kimpel, Thomas Lostak
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Abstract
An aqueous agent for the anticorrosive treatment of metallic substrates and to a method for coating such substrates. The aqueous agent according to this invention includes at least one compound that dissociates into zirconium- or titanium-fluorine complexes in aqueous solution, at least one water-soluble compound that releases metal cations, the metal cations being selected from the group composed of: iron-, copper-, or silver ions, and a water-soluble alkoxysilane that has at least one epoxy group.
Claims23
An aqueous conversion solution for an anticorrosive treatment of metallic substrates as a pre-treatment for a further lacquer coating, including:
- at least one compound that dissociates into zirconium- or titanium-flourine complexes in aqueous solution,
- at least one water-soluble compound that releases metal cations, selected from the group composed of:
- iron-, copper-, or silver ions, and
- a water-soluble alkoxysilane that has at least one epoxy group as an adhesion-promoting phase, the alkoxysilane comprising a [3-2(2,3-epoxypropoxy)-propyl]-trimethoxysilane, a [3-2(2,3-epoxypropoxy)-propyl]-triethoxysilane, a [3-2(2, 3 -epoxypropoxy)-propyl]-methyldiethoxysilane, a [3-2(2,3 -epoxypropoxy)-propyl]-methyldimethoxysilane, a [3-2(2,3-epoxypropoxy)-propyl]-dimethylethoxysilane, or combinations thereof.
- wherein the conversion solution is essentially free of phosphate, chromium, and silanes having amino groups, and the epoxy group of the adhesion-promoting phase reacts with an amino group of the further lacquer coating.
Dependencies are inferred from the claim text.