Patent ID: 7645331

Claim:
A corrosion inhibiting composition formed by combining components comprising: (a) an inorganic phosphate; (b) a water soluble polyelectrolyte polymer dispersant; (c) a tri or tetracarboxylic acid; and (d) at least one additional component comprising at least one selected from the group consisting of a C 4 -C 22 aliphatic or aromatic mono- or dicarboxylic acid; a silicate and at least one of a silicone or a silicate stabilizing siloxane compound; and combinations comprising at least one of the foregoing; wherein the tri- or tetracarboxylic acid (c) comprises a C 4 to C 20 aliphatic tetra-carboxylic acid where the carboxylic groups are located at 1, 2, 3, 4 positions, a C 3 to C 24 aliphatic tricarboxylic acid or the corresponding anhydrides without or with at least one additional hydroxyl group in an aliphatic chain.