Process for the collective pretreatment of steel, galvanized steel, magnesium and aluminum before bonding to rubber

US6440231B1 · kind B1 · utility

Assignee

• Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

• Wolf-Dieter Beiersdorf · Goldkronach, DE
• Werner Gruber · Erkrath, DE
• Hans Scheer · Düsseldorf, DE
• Juergen Foell · Goldkronach, DE
• Birgit Gies · Langenfeld, DE
• Peter Kuhm · Hilden, DE
• Franz-Josef Schueller · Monheim, DE

Key dates

• Filing date: Jul 19, 1996
• Grant date: Aug 27, 2002
• Expiry date: Jul 19, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23C22/44
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A process for the production of a rubber-to-metal bond on steel, galvanized steel, aluminum and/or magnesium is provided The process comprises at least the following steps:a) chemical pretreatment of the metal parts,b) intermediate rinsing, andc) vulcanizing-on of natural or synthetic rubber using primers and/or binders.The chemical pretreatment in step a) is carried out with an aqueous solution with a pH value of 3.5 to 5.5 which contains:4 to 20 g/l of phosphate ions,0.1 to 1 g/l of free or complexed fluoride, and0.04 to 1 g/l of nitrate ions.