Patent ID: 8227398

Claim:
A corrosion inhibitor composition consisting of: a) an alkyleneoxy-alkyl phosphate di- or triester having the general formula wherein Z is either —O-M or —O-(AO) n 2 -Alkyl, and further wherein M is an ammonium, alkali metal or alkaline earth metal cation, Alkyl independent from each other, is a straight or branched, saturated or unsaturated alkyl group having from 5 to 22 carbon atoms or is an alkylaryl group wherein alkyl is as defined above and aryl is a monocyclic or bicyclic aromatic group, AO represents an alkylene oxide having from 2 to 4 carbon atoms which may be substituted by one or more C 1-3 alkyl groups, and n 1 , n 2 and n 3 independent from each other are an integer of from 2 to 10; b) an alkaline agent in an amount sufficient to achieve a pH of >7.0 in the global composition; c) a chelating agent; d) an alkanolamine; e) a nonionic surfactant; f) water; and g) a hydrotrope.