Metal corrosion inhibition in closed cooling systems

Details Metal corrosion inhibition in closed cooling systems Metal corrosion inhibition in closed cooling systems

1986-01-17

1988-03-01

Wax, Robert

Compositions

Heat-exchange, low-freezing or pour point, or high boiling...

Organic components

252 493, 252387, 25238954, 25238962, 422 7, 422 16, 422 19, C09K 500

Patent

active

047284528

ABSTRACT:
The corrosion of metals in closed, aqueous cooling systems having a pH of 7.5 to 10.5 is inhibited by adding to the system a coolant concentrate comprising water, at least 10% by weight of a water soluble nitrite or a mixture of a water soluble nitrite and a water soluble nitrate, 0.2 to 2.0% by weight of at least one water soluble azole, and 0.1 to 1.0% by weight of a water soluble molybdate, to provide in the system concentrations of at least 200 ppm of the nitrite or nitrite
itrate mixture, 2 to 20 ppm of the azole and 1 to 10 ppm of the molybdate.

REFERENCES:
patent: 2147395 (1939-02-01), Bayes
patent: 3335096 (1967-08-01), Hatch
patent: 4098720 (1978-07-01), Hwa
patent: 4149969 (1979-04-01), Robitaille et al.
patent: 4452715 (1984-06-01), Hirozawa
patent: 4548787 (1985-10-01), Wilson et al.
patent: 4561990 (1985-12-01), Darden
Zucker, "Prevention of Corrosion Failures in Electrical Equipment", Proc. Tech. Assoc., Pulp Pap. Ind., 1982 (Eng. Conf. Bk. 2), 457-460.

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