Corrosion inhibiting coolant compositions

Details Corrosion inhibiting coolant compositions Corrosion inhibiting coolant compositions

1995-10-10

1998-09-22

McGinty, Douglas J.

Compositions

Frost-preventing, ice-thawing, thermostatic, thermophoric,...

252 76, 252 79, 252 75, C09K 500

Patent

active

058110259

ABSTRACT:
Coolant compositions are disclosed which include only a minimum amount of metal corrosion inhibitor. The coolant compositions effectively inhibit: (1) metal corrosion; (2) precipitation of the included metal corrosion inhibitor; (3) oxidative deterioration of the included glycol; (4) lowering of the pH value of coolant fluid; and (5) chemical reaction with hard water components. A coolant composition of the invention includes an alkylbenzoic acid (or acids) or a salt (or salts) thereof, a hydrocarbon triazole and an alkali nitrate in addition to a glycol (or glycols) as a base, water and others. It is characteristic that the coolant compositions of the present invention do not include any aliphatic monobasic acids.

REFERENCES:
patent: 4292190 (1981-09-01), Davis et al.
patent: 4382008 (1983-05-01), Boreland et al.
patent: 4450088 (1984-05-01), Wilson et al.
patent: 4587028 (1986-05-01), Darden
patent: 4851145 (1989-07-01), Van Neste et al.

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