Texaco Inc.

Edward S Peterson

Jerome W Darden

Carol A Triebel

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

Stabilizers for inorganic silicate corrosion inhibitor additives in antifreeze/coolant formulations are described. The stabilizers have the structure ##STR1## where n is an integer from 1 to 20 and R is a solubilizing agent. The solubilizing group may be a cyano-terminated group, a diol ether group, an acid group, an amide group, a group which will yield a diol on hydrolysis, among others. These stabilizers help prevent the inorganic silicate additives from precipitating out and thus extend the shelf life of antifreeze formulations into which they are incorporated.

Growing community of inventors

Austin, TX, United States of America

Edward S Peterson