Extended Operation Engine Coolant Composition

摘要

The invention relates to an engine coolant composition, and a method of increasing the operational life of a coolant composition in an engine, wherein an isononanoic acid is incorporated into the generally glycol based coolant fluid in place of nitrous acid or its salt to reduce pitting corrosion on iron containing surfaces, and one or more hydroxybenzoic acids are incorporated.

主权项

1. An engine coolant composition comprising:
50% or more by weight of a glycol-based coolant liquid; between about 0.1% by weight and about 10% by weight of a first carboxyl component selected from the group consisting of aliphatic dibasic acids or their salts having from 5 to 13 carbons, and mixtures thereof; between about 0.01% by weight and about 10% by weight of isononanoic acid or a salt formed therefrom; at least one inorganic acid or its salt as a corrosion inhibitor, selected from the group consisting of molybdates, phosphates, and combinations thereof; and a buffer selected from the group consisting of 2-hydroxybenzoic acid, 3-hydroxybenzoic acid, 4-hydroxybenzoic acid, 2,4-dihydroxybenzoic acid, 2,6-dihydroxybenzoic acid, and combinations thereof; wherein the composition excludes nitrous acid or the alkali metal, alkaline earth, or ammonium salts thereof; and the composition excludes silicates.