| 摘要 |
Disclosed is an improved water-based hydraulic fluid composition which comprises an aqueous composition having a viscosity of at least 5 centistokes at 40 DEG C. which contains up to about 95 percent by weight of water, at least 0.1 percent by weight of a carboxylic acid lubricity agent, and an effective amount of at least one selected anti-wear additive; wherein the improvement comprises: said anti-wear agent comprising the combination of: (a) mono-, di-, or trihydroxy-substituted aromatic compound; with (b) an aromatic compound substituted with one to three electron-withdrawing substituents, wherein said electron-withdrawing substituents are selected from the group consisting of cyano, sulfo, and mixtures thereof.
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