| abstract |
Water-miscible corrosion inhibitors, substantially consisting of (A) reaction products of boric acid and diethanolamine, and (B) arylsulfonamidocarboxylic acids of the formula I <IMAGE> in which R1 and R2 each represent hydrogen, fluorine, chlorine, bromine, an alkyl or alkoxy radical having from 1 to 4 carbon atoms, with the proviso that the sum of the carbon atoms of R1 and R2 does not exceed 7; Ar is a benzene, naphthalene or anthracene radical; R3 is hydrogen, an aryl radical having up to 4 carbon atoms, a beta -cyanoethyl or hydroxyalkyl radical having from 2 to 4 carbon atoms; R4 is an alkylene radical having more than 3 carbon atoms, optionally substituted by one or more methyl or ethyl radicals; and n is 1 or 2; or alkyl- and/or cycloalkylsulfonamidocarboxylic acids obtained by sulfochlorination of a saturated aliphatic and/or cycloaliphatic hydrocarbon having from 12 to 22 carbon atoms and a boiling temperature range of from about 200 DEG to 350 DEG C., subsequent reaction with ammonia and final condensation with chloroacetic acid. |