Corrosion protection in cooling water systems

Details Corrosion protection in cooling water systems Corrosion protection in cooling water systems

C - Chemistry, Metallurgy

23

F

31/35

C23F 11/167 (2006.01) C23F 11/16 (2006.01)

Patent

CA 1195835

Abstract of the Disclosure A composition and method for inhibiting ferrous metal corrosion in an aqueous system consisting essentially of a copolymer of styrene sulfonic acid and maleic anhydride or maleic acid, and water-soluble salts of said copolymer; and a blend of two phosphonates consisting of (1) 2-phosphonobutane- 1,2,4-tricarboxylicacid and (2) one member of the group consisting of (a) aminotrimethylene phosphonic acid and (b) hydroxy ethylidene diphosphonic acid. A preferred dosage, based on the active ingredient, is 7.5 ppm of styrene sulfonic acid/maleic anhydride copolymer and 3.6 ppm of phosphonate (1) and either 3.5 ppm of phosphonate (2a) or 4.2 ppm of phosphonate (2b). This relationship can be maintained during a total dosage of 0.01 to 500 ppm.

427157

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