Use of quaternized imidazoles as corrosion inhibitors for non-ferrous metals, and coolant compositions and antifreeze concentrates comprising them

US6045719A · kind A · utility

Assignee

• BASF SE

Inventors

• Ladislaus Meszaros · Mutterstadt, DE
• Michael Gillich · Mutterstadt, DE
• Klaus Pfitzner
• Knut Oppenlander · Ludwigshafen, DE
• Wolfgang H. H. Gunther · Hersbruck, DE

Key dates

• Filing date: Aug 11, 1998
• Grant date: Apr 4, 2000
• Expiry date: Aug 11, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23G1/061
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Quaternized imidazoles I ##STR1## in which R.sup.1 and R.sup.3 independently of one another are saturated or unsaturated hydrocarbon radicals of 1-12 carbon atoms which can be substituted by oxygen-functional groups or interrupted by nonadjacent oxygens, PA0 R.sup.2, R.sup.4 and R.sup.5 independently of one another are hydrogen or saturated or unsaturated hydrocarbon radicals of 1-12 carbon atoms which can be substituted by oxygen-functional groups or interrupted by nonadjacent oxygens, it being possible for R.sup.4 and R.sup.5, together with the corresponding imidazole carbons, to form a five- or six-membered ring, and PA0 X.sup..crclbar. is an anion, are used as corrosion inhibitors in the corrosion protection of nonferrous metals, especially for car radiator protection.