USE OF TRIAZINE-CARBOXYLIC ACIDS AS CORROSION INHIBITORS FOR AQUEOUS SYSTEMS

摘要

Triazine di- and tricarboxylic acids of the formula wherein Z is a straight-chain or branched chain unsubstituted or substituted 1-11C alkylene group, a 2 or 3C alkenylene group, a 5-12C cycloalkylene group or an unsubstituted or substituted arylene group, X is H, an alkali metal, an alkaline earth metal, NH4+ or a primary, secondary or tertiary 1-12C ammonium residue, R1 and R2 are the same or different and each is H, 1-4C alkyl or a group -Z-COOX or R1 or R2 together with Z can form a 5- or 6-membered heterocyclic ring, R3 is 1-12C alkyl, phenyl or a group of formula -NR4R5, -OR6 or -SR6 in which R4 and R5, independently, are H, 1-12C alkyl optionally substituted by a hydroxyl group, cyclohexyl, an aryl group having from 6 to 10 ring carbon atoms, optionally substituted or a group -Z-COOX and R6 is H, 1-12C alkyl, or a 6-12C aryl group, are excellent corrosion inhibitors for aqueous systems in contact with ferrous metals. Such systems may be e.g. water circuits, aqueous machining fluids or any other aqueous functional fluids.