Patent ID: 6238621
Filing Date: 2001-05-29
Classification: C10M,C10N,C23F

Abstract:
A method of inhibiting corrosion in an aqueous metal working composition comprising:adding a corrosion inhibiting composition to said aqueous metal working fluid composition in an amount effective to inhibit corrosion at a pH in the range of 6-12, wherein said corrosion inhibiting composition comprises:(a) at least one amido acid or salt thereof having the formula ##STR9##wherein R is an alkyl or alkenyl group having about 4 to about 21 carbon atoms, M and M' are cations independently selected from hydrogen, alkali metal or amine salts, and m and n independently represent an integer from 0 to 2; and(b) at least one of an aryltriazole having the formula ##STR10##or 3-amino-1,2,4-triazole, wherein Y is an alkyl group having 1 to about 6 carbon atoms or --COO--M.sup.+, M"" is hydrogen or an alkali metal, and p is an integer from 0 to 4;wherein the molar ratio of (a) to (b) is about 0.34:1 to about 5:1.