Corrosion inhibited freeze protected heat transfer fluid
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United States of America Patent
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-
Oct 8, 1985
Grant Date -
N/A
app pub date -
May 7, 1984
filing date -
May 7, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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