Anionic wetting agents for stabilizing self-depositing compositions comprising oxidic pigments

US8946323B2 · kind B2 · utility

Assignee

• Henkel AG & Co. KGaA · DE

Inventors

• Ulrike Schmidt-Freytag · Mülheim an der Ruhr, DE
• Ute Herrmann · Wuppertal, DE

Key dates

• Filing date: Nov 9, 2011
• Grant date: Feb 3, 2015
• Expiry date: Dec 25, 2031

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B05D7/142
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to an acidic aqueous particulate composition containing, in addition to iron(III) ions, fluoride ions and at least one water-insoluble, dispersed organic binder, a water-insoluble, dispersed oxide pigment with elevated resistance to agglomeration for the autophoretic deposition of organic-inorganic hybrid layers onto metal surfaces, the composition additionally containing at least one anionic wetting agent which comprises functional groups selected from sulfonates, phosphonates and/or carboxylates. The invention furthermore comprises the use of such a composition for the autodeposition of a film-forming organic-inorganic hybrid coating onto metal surfaces which are at least in part selected from surfaces, the main constituents of which are iron, zinc and/or aluminum.