Texaco Inc.

S.a. Texaco Belgium N.v.

Texaco Inc. & S.a. Texaco Petro, N.v.

Carol A Triebel

Jerome W Darden

Jean P Maes

George P Speranza

Ernest L Yeakey

David R McCoy

Roger G Duranleau

Clifford L Lambert, Jr

Walter A Van Neste

Edward S Peterson

A corrosion-inhibited antifreeze concentrate formulation containing no phosphate, amine, or nitrite compounds consists essentially of:

Corrosion-inhibited antifreeze formulation

A corrosion inhibitor for use in water and liquid alcohol antifreeze/coolant compositions comprising the combination of a C.sub.5 -C.sub.16 aliphatic monobasic acid or the alkali metal, ammonium, or amine salt of said acid, a C.sub.5 -C.sub.16 hydrocarbyl dibasic acid or the alkali metal, ammonium, or amine salt of said acid, and a hydrocarbyl triazole gives synergistic corrosion protection to metal surfaces as compared with formulations containing either the monoacid or diacid component alone, or formulations containing other conventional corrosion inhibitors.

Monobasic-dibasic acid/salt antifreeze corrosion inhibitor

A corrosion inhibited antifreeze composition using a three-part corrosion inhibitor mixture is described. A dicarboxylic acid component, an alkali metal silicate and a triazole comprise the three corrosion inhibitors. Use of this type of mixture permits the express exclusion of amines, nitrites, nitrates, chromates, borates and phosphates and their attendant disadvantages. Nevertheless, the inventive system provides excellent corrosion resistance in alcohol-based antifreeze, particularly with respect to aluminum.

Non-borate, non-phosphate antifreeze formulations containing dibasic

A corrosion inhibited antifreeze composition incorporating a corrosion inhibitor is described. The dibasic salt of naphthalene dicarboxylic acid and optionally a triazole comprise the corrosion inhibitor.

Naphthalene dicarboxylic acid salts as corrosion inhibitors

The use of methylene azelaic acid having the formula CH.sub.2 .dbd.C--[(CH.sub.2).sub.3 --COOH].sub.2 or an alkali metal salt thereof in glycol and water based automotive antifreeze formulations is described. Unlike natural dicarboxylic acids such as sebacic acid, methylene azelaic acid does not form a precipitate and drop out of solution, rendering the antifreeze unprotected against corrosion. The methylene azelaic acid component should be present in an amount of from 1.5 to 4.5 wt. % based on the glycol component.

Growing community of inventors

Austin, TX, United States of America

Carol A Triebel