Process and composition for inhibiting corrosion of metal parts

Compositions – Water-softening or purifying or scale-inhibiting agents – Plant or organic material containing

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210 58, 252180, 252389A, 252390, 252391, 422 16, C02B 502, C02B 506

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active

041499697

ABSTRACT:
A process and a composition for inhibiting corrosion of metal parts in water systems such as in recirculating cooling towers and the like, while additionally suppressing scale formation and inhibiting corrosion of copper and copper-containing alloys which comprises adding and dissolving in the aqueous system, a controlled combination of active constituents in effective amounts comprising as essential constituents, an alkali molybdate salt, a divalent metal cation selected from the group consisting of ZN.sup.++, Mn.sup.++ and Ni.sup.++ ; 1-hydroxyethylidene-1,1-diphosphonic acid and the aqueous soluble alkali salts thereof; and an organic agent selected from the group consisting of 2-mercaptobenzothiazole and the alkali salts thereof; 1,2,3-benzotriazole, and tolyltriazole.

REFERENCES:
patent: 3714066 (1973-01-01), King et al.
patent: 3794603 (1974-02-01), O'Neal Jr. et al.
patent: 3891568 (1975-06-01), Nishio et al.
patent: 3989637 (1976-11-01), Hogue et al.

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