Corrosion inhibitors

Details Corrosion inhibitors Corrosion inhibitors

1982-06-28

1983-10-11

Gluck, Irwin

Compositions

Preservative agents

Anti-corrosion

106 1412, 106 1416, 106 1417, 106 1421, 106 1442, 106 1444, 252 855E, 252181, 422 15, 422 16, 422 18, 422 19, C23F 1116, C23F 1114, C23F 1112, C23F 1118

Patent

active

044091214

ABSTRACT:
Corrosion and scale-inhibiting compositions which are useful in recirculating aqueous systems comprise a mixture of a phosphate compound, a phosphonate compound comprising 1-hydroxyethylidene-1,1-diphosphonic acid or nitrilotris(methylene)triphosphonic acid, an aryl triazole, and a salt of a metal selected from the group consisting of molybdenum, tungsten and chromium. In the preferred embodiment of the invention, the phosphate compound is present in a weight percent ratio in the range of from about 2.5:1 to about 4:1 weight percent per weight percent of the metal salt. An example of an effective anti-corrosion composition comprises a mixture of sodium tripolyphosphate, 1-hydroxyethylidene-1,1-diphosphonic acid, benzotriazole and sodium molybdate, said composition being present in an amount of from about 5 to about 5,000 ppm.

REFERENCES:
patent: B336566 (1975-01-01), Powell
patent: 3714066 (1973-01-01), King et al.
patent: 3723347 (1973-03-01), Mitchell
patent: 3992318 (1976-11-01), Gaupp et al.
patent: 4101441 (1978-07-01), Hwa et al.
patent: 4176059 (1979-11-01), Suzuki
patent: 4206075 (1980-06-01), Boffardi
patent: 4209487 (1980-06-01), Hogue et al.
patent: 4217216 (1980-08-01), Lipinski

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