Process for the coating of passivated metallic surfaces of components and such coated components
AssigneesFraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., FEW Chemicals GmbH
InventorsSiegfried Berg, Thomas Bolch, Friedrich Auer
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Abstract
The invention relates to a process which is suitable for applying a permanently adhering, stable, dirt and water repellent coating to metallic surfaces, specifically chromium surfaces, specifically sanitary and kitchen fixtures, and also to the components coated in this manner. The process is based on first chemically activating the surface and then coating it by means of a sol.
Claims15
Process for coating passivated metallic surfaces of components comprising the following steps:
- Ia) chemical activation of the passivated surface using a solution containing surfactants and/or
- Ib) chemical activation of the passivated surface by reduction with a reducing agent or direct current and/or
- Ic) physical activation of the passivated surface using the sputter method and
- II) coating the activated surface with at least one sol and formation of a gel, wherein direct current is additionally applied to the component during chemical activation.
Process for coating passivated metallic surfaces of sanitary and kitchen fixtures comprising the steps of:
- activating the passivated surface by at least one of (a) chemical activation by using a solution containing surfacants;
- (b) chemical activation by reduction with a reducing agent or direct current;
- and (c) physical activation by using the sputter method;
- and coating the activated surface with at least one sol and formation of a gel, wherein direct current is additionally applied to the fixture during chemical activation.
Process for coating passivated metallic surfaces of household appliances comprising the steps of:
- activating the passivated surface by at least one of (a) chemical activation by using a solution containing surfacants;
- (b) chemical activation by reduction with a reducing agent or direct current;
- and (c) physical activation by using the sputter method;
- and coating the activated surface with at least one sol and formation of a gel, wherein direct current is additionally applied to the appliance during chemical activation.
Dependencies are inferred from the claim text.