CORROSION INHIBITOR FOR ANTIFREEZES Russian patent published in 1999 - IPC

FIELD: chemical technology, more particularly cooling systems in internal combustion engines and heat carrier in heat exchangers. SUBSTANCE: corrosion inhibitor comprises, wt %: 73% orthophosphoric acid, 0.75-2.90; potassium or sodium hydroxide; potassium or sodium hydroxide, 0.55-2.10; potassium or sodium carbonate, 0.50-0.60; 2- mercaptobenzthiazole alkali metal salt; trilon B, 0.20- 0.25; decahydrate sodium tetraborate, 6.0-8.0 water; 14.0-15.0; and the ethylene glycol balance. EFFECT: high protective properties of the inhibitor which is ecologically safe. 19 ex, 3 tbl