Corrosion protection in cooling water systems

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

1983-07-18

1985-10-15

Cockeram, Herbert S.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

252389R, 524136, 524139, C08K 516, C09K 300, C23F 1100

Patent

active

045475407

ABSTRACT:
A composition and method for inhibiting ferrous metal corrosion in aqueous systems consisting essentially of (A) a copolymer of styrene sulfonic acid and maleic anhydride or maleic acid, and (B), water-soluble salts of said copolymer; and (C) a blend of two phosphonates consisting of (1) 2-phosphonobutane-1,2,4-tricarboxylic acid 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 6.0 ppm of phosphonate (1) and either 3.5 ppm of phosphonate (2a) of 4.2 ppm of phosphonate (2b). This relationship can be maintained during a total dosage of 0.01 to 500 ppm.

REFERENCES:
patent: 3886204 (1975-05-01), Geffers et al.
patent: 3886205 (1975-05-01), Geffers et al.
patent: 3959168 (1976-05-01), Germscheid et al.
patent: 4255259 (1981-03-01), Hwa et al.
patent: 4288327 (1981-09-01), Godlewski et al.
patent: 4306991 (1981-12-01), Hwa et al.

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