Method for coating metallic surfaces of substrates, and objects coated according to said method

US9556523B2 · kind B2 · utility

Assignee

• CHEMETALL GMBH · DE

Inventors

• Daniel Wasserfallen · Mainz, DE
• Michael Schwamb · Frankfurt, DE
• Aliaksandr Frenkel · Frankfurt, DE
• Vera Sotke · Schwalbach am Taunus, DE
• Wolfgang Bremser · Münster, DE
• Martin Droll · Schlangen, DE
• Oliver Seewald · Marsberg, DE
• Ron Eilinghoff · Frankfurt, DE
• Stephanie Gerold · Paderborn, DE
• Evgenija Niesen · Soest, DE
• Lars Schachtsiek · Paderborn, DE
• Manuel Traut · Hamm, DE

Key dates

• Filing date: Feb 7, 2013
• Grant date: Jan 31, 2017
• Expiry date: Apr 13, 2033

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B05D7/14
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A method and composition for coating surfaces, a corresponding coating and the use of objects coated according to said method. A cleaned, metallic surface is contacted with an aqueous composition that is a dispersion or suspension, and drying and/or baking the organic coating or optionally, drying the organic coating and coating with an equivalent or additional coating composition prior to a drying and/or baking. The aqueous composition has a pH of 4 to 11 and contains an anionic polyelectrolyte in a quantity of 0.01 to 5.0 wt. % relative to the total mass of the composition, which may have a solids content of from 2 to 40 wt. %. The solids have an average particle size from 10 to 1000 nm. A coating forms on the basis of an ionogenic gel which binds cations released from the metallic surface that originate from a pretreatment stage or from the contacting.