Method for coating metallic surfaces with nanocrystalline zinc oxide layers, aqueous compositions therefor and use of the surfaces coated in this way

US9970113B2 · kind B2 · utility

Assignee

• CHEMETALL GMBH · DE

Inventors

• Özlem Özcan · Paderborn, DE
• Guido Grundmeier · Paderborn, DE
• Peter Schubach · Nidderau, DE

Key dates

• Filing date: Nov 13, 2013
• Grant date: May 15, 2018
• Expiry date: Jan 17, 2034

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31663
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A method for coating metallic surfaces with an aqueous composition, which contains an aqueous solution of a zinc salt, by flooding, spraying and/or immersion, wherein, for spraying or immersion, the initial temperature of the substrate lies in the range from 5 to 400° C., in that, for flooding, the initial temperature of the substrate lies in the range from 100 to 400° C. and in that an anticorrosive nanocrystalline zinc oxide layer is formed on the metallic surface. Corresponding aqueous composition, the nanocrystalline zinc oxide layer and the use of the coated substrates are also disclosed.