Method for providing a metal surface with a vitreous layer

US6162498A · kind A · utility

Assignee

• Institut fuer Neue Materialien gemeinnuetzige GmbH · DE

Inventors

• Martin Mennig · Idar-Oberstein, DE
• Gerhard Jonschker · Friedrichsthal, DE
• Helmut Schmidt · Riegelsberg, DE

Key dates

• Filing date: Oct 8, 1999
• Grant date: Dec 19, 2000
• Expiry date: Oct 8, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T50/60
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Disclosed is a process for providing a metallic surface with a vitreous layer which is both decorative and scratch resistant and corrosion inhibiting. Said process is characterized in that a coating composition which is obtainable by a process comprising the hydrolysis and polycondensation of one or more silanes of the general formula (I) EQU R.sub.n SiX.sub.4-n (I) wherein the groups X, the same or different from each other, are hydrolyzable groups or hydroxyl groups, the radicals R, the same or different from each other, represent hydrogen, alkyl, alkenyl or alkynyl groups having up to 12 carbon atoms and aryl, aralkyl and alkaryl groups having 6 to 10 carbon atoms, and n is 0, 1 or 2, provided that at least one silane with n=1 or 2 is employed, or oligomers derived therefrom, in the presence of PA1 a) nanoscaled SiO.sub.2 particles and/or PA1 b) at least one compound selected from the group consisting of the oxides and hydroxides of the alkali and alkaline earth metals; is applied onto said metallic surface and the resulting coating is thermally densified to form a vitreous layer.