USE OF QUATERNIZED IMIDAZOLES AS CORROSION INHIBITORS FOR NON-FERROUS METALS, AND COOLANT COMPOSITIONS AND ANTIFREEZE CONCENTRATES COMPRISING THEM

摘要

Quaternized imidazoles I (see formula I) in which R1 and R3 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, R2, R4 and R5 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 R4 and R5, together with the corresponding imidazole carbons, to form a five- or six-membered ring, and X.THETA. is an anion, are used as corrosion inhibitors in the corrosion protection of nonferrous metals, especially for car radiator protection.