Patent ID: 7727420
Filing Date: 2010-06-01
Classification: C09G,C11D

Abstract:
1. A corrosion inhibitor for use in an aqueous or semi-aqueous solvent system which consists of; a) a monomeric chelating agent selected from the group consisting of a multifunctional aromatic acid, multifunctional aromatic anhydride, multi-functional aliphatic acid, multi-functional aliphatic anhydride, aromatic or aliphatic amino acids, aromatic or aliphatic di or tri-amines and b) an acidic film forming polymeric chelating agent which forms a 5, 6, or 7-membered chelating ring with a metal surface of a transition metal which is oxidizable to a single or multivalent stable state, said corrosion inhibitor being neutralized or partially neutralized; whereby said corrosion inhibitor forms a 5-7 member chelating ring with said metal surface.