Hydrolytically stable hydraulic lubricant
AssigneeAfton Chemical Corporation
InventorsRalph Lumby, Helen Dyer
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Abstract
Lubricant compositions may provide corrosion resistance, oxidation resistance, and reduced wear for hydraulic systems. A lubricant composition may comprise an ashless dithiophosphate in an amount sufficient to provide a concentration of phosphorus ranging from 10 ppm to 250 ppm to the lubricant composition, a metal dialkyl dithiophosphate such as zinc dialkyl dithiophosphate (ZDDP) in an amount sufficient to provide a concentration of phosphorus ranging from 50 ppm to 1000 ppm to the lubricant composition, a corrosion inhibitor comprising an alkyltriazole derivative in an amount sufficient to provide a concentration of nitrogen ranging from 0.75 ppm to 100 ppm to the lubricant composition, and a major amount of a base oil.
Claims18
A lubricant composition comprising:
- an ashless dithiophosphate;
- a metal dialkyl dithiophosphate;
- a corrosion inhibitor comprising an alkyltriazole derivative in an amount sufficient to provide a concentration of nitrogen ranging from 0.75 ppm to 100 ppm to the lubricant composition;
- a major amount of a base oil;
- and
- wherein the corrosion inhibitor is substantially free of benzotriazole and benzotriazole derivatives and substantially free of tolyltriazole and tolyltriazole derivatives.
Dependencies are inferred from the claim text.