Patent ID: 6277302
Filing Date: 2001-08-21
Classification: C09K,C23F

Abstract:
A method for inhibiting the corrosion of ferrous metals in contact with a metal-corrosive aqueous system selected from the group consisting of aqueous fertilizer systems and low hardness water systems which comprises supplying to the aqueous system a corrosion-inhibiting amount of a composition comprising (i) a substantially water-soluble polymer of at least one acidic amino acid selected from the group consisting of aspartic acid and glutamic acid and (ii) at least one water-soluble salt selected from the group consisting of molybdate salts having an alkali metal cation and zinc salts having an anion derived from an inorganic mineral acid, the supplied weight ratio of component (i) to component (ii) being in the range of about 0.01:1 to about 1,000,000:1;such that the corrosion inhibition is greater relative to the additive corrosion inhibition effects attributable to component (i) and component (ii).