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

US11261337B2 · 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
• Ron Eilinghoff · Frankfurt, DE
• Stephanie Gerold · Paderborn, DE
• Evgenija Niesen · Soest, DE
• Lars Schachtsiek · Paderborn, DE
• Manuel Traut · Hamm, DE
• Oliver Seewald · Marsberg, DE

Key dates

• Filing date: Jul 16, 2019
• Grant date: Mar 1, 2022
• Expiry date: Jul 16, 2039

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D133/06
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A coating, a method for coating surfaces, and the coated surfaces. The method includes providing a substrate with a cleaned metal surface; contacting and coating the metal surface with an aqueous composition having a ph of from 0.5 to 7.0 and in the form of a dispersion and/or a suspension; optionally rinsing the organic coating; and drying and/or baking the organic coating, or optionally drying the organic coating and coating same with a similar or another coating composition thereto. The composition contains a complex fluoride in a quantity of 1.1 10−6 mol/l to 0.30 mol/l based on the cations. An anionic polyelectrolyte in a quantity of 0.01 to 5.0 wt % based on the total mass of the resulting mixture is added to an anionically stabilized dispersion made of film-forming polymers and/or a suspension made of film-forming inorganic particles.