Method for prevention of metallic precipitate reoxidation/rediss

Details Method for prevention of metallic precipitate reoxidation/rediss Method for prevention of metallic precipitate reoxidation/rediss

1985-12-06

1987-10-06

Fisher, Richard V.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210719, 210726, 210728, 210912, C02F 152

Patent

active

046981624

ABSTRACT:
Redissolution and/or reoxidation of metals precipitated by chemical reduction from aqueous solutions can be prevented by adding a bicyclic, aromatic, organonitrogen compound to the solution in a amount insufficient to cause precipitation of said metal but sufficient to prevent the redissolution and reoxidation of the precipitate. The compounds added can be selected from benzotriazoles, benzothiazols and benzimidazoles.

REFERENCES:
patent: 3857765 (1974-12-01), Merker et al.
patent: 3985503 (1976-10-01), O'Neal, Jr.
R. Walker, "Benzotriazole as a Corrosion Inhibitor for Immersed Copper", Corrosion, vol. 29, No. 7, Jul. (1973), p. 290.
Metal Finishing Guidebook, 52nd Issue (1984), pp. 286-287.

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