Patent ID: 8114343

Claim:
A method for inhibiting corrosion of a surface contacted by a hypochlorite source comprising: adding a corrosion inhibitor to a hypochlorite source to form a corrosion inhibitor use solution, wherein said corrosion inhibitor concentration in said use solution is from about 25 ppm to about 3000 ppm, and wherein said corrosion inhibitor comprises a water soluble zinc salt and a non-oxidizing water soluble calcium salt; wherein said corrosion inhibitor is free of aluminum salt and wherein the ratio of said hypochlorite source to corrosion inhibitor is from about 10:1 to about 600:1; and wherein said corrosion use solution made from adding said corrosion inhibitor to said hypochlorite source, is free of carbonate and bicarbonate anions; contacting a surface with said corrosion inhibitor use solution, wherein said composition inhibits the corrosion of said surface in the presence of said hypochlorite source.