Patent ID: 7410596

Claim:
An aqueous absorption solution consisting of water, at least one alkali metal hydroxide, alkaline earth metal hydroxide, or a mixture thereof, and at least one heteropoly complex anion of a transition metal element present in an amount sufficient to provide a corrosion inhibiting effect, the alkali metal hydroxide, alkaline earth metal hydroxide or mixture thereof is present in an amount from about 20 to about 80 weight percent, based on the total weight of the solution and wherein said at least one heteropoly complex anion is a compound selected from the group consisting of [XaMbOc]-n, [XaZdMbOc]-n, [XaZdMbOcHe]-n, [XaMbOc(OH)f]-n, [XaZdMbOc(OH)f]-n, and mixtures thereof, wherein: X and Z are central heteroatoms selected from the group consisting of elements from Groups I-VIII of the Periodic Table of Elements; a is 1 or 2; d is an integer from 0 to 4; MbOc, MbOcHe, and MbOc(OH)f are oxoanions in which M is a transition metal element; b is an integer from 5 to 22; c is an integer from 20 to 70; e is an integer from 0 to 6; and f is an integer from 0 to 3; and n is the charge of the anion.