Corrosion inhibited freeze protected heat transfer fluid

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

C - Chemistry, Metallurgy

09

K

31/51

C09K 5/00 (2006.01) C09K 5/20 (2006.01) C23F 11/08 (2006.01) C23F 11/18 (2006.01)

Patent

CA 1254027

Abstract of the Disclosure 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 PO4, greater than 0.025 weight percent nitrite as NO2, 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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