Corrosion inhibited freeze protected heat transfer fluid

Details Corrosion inhibited freeze protected heat transfer fluid Corrosion inhibited freeze protected heat transfer fluid

1984-05-07

1985-10-08

Lieberman, Paul

Compositions

Preservative agents

Anti-corrosion

252392, 252396, 422 16, C23F 1100

Patent

active

045459258

ABSTRACT:
An improved corrosion inhibited, freeze protected, heat transfer fluid or antifreeze composition which is comprised of at least about 0.25 weight percent phosphate as PO.sub.4, greater than 0.025 weight percent nitrite as NO.sub.2, and the balance a polyhydroxy alcohol; with the proviso that nitrate not be present in the heat transfer fluid. When the heat transfer fluid is to be used as an antifreeze composition for internal combustion engines, it can also contain a corrosion inhibitor selected from the group consisting of 2-mercaptobenzotriazole, tolyltriazole, benzotriazole, and alkali metal salts thereof and a buffering agent.

REFERENCES:
patent: 3090757 (1963-05-01), Berger
patent: 3414519 (1968-12-01), Suffern
patent: 3445395 (1969-05-01), Boehmer
patent: 3769220 (1973-10-01), Willard et al.

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