Abstract
Tribological performance of a monophosphate ester of a fatty alkyl ether of polyoxyethylene, a boron containing amide, a dialkyl dithiophosphate ester and a mixture of these (compound) as extreme pressure (EP)/antiwear (AW) additives in hydrogenated base oil (GH) was investigated using four-ball test machines. Elemental composition and chemical nature of the AW films generated on the surfaces of the steel balls were studied using X-ray photoelectron spectroscopy (XPS), and their AW mechanisms are hereby proposed. Thermal degradation tests were conducted to identify their thermal stabilities using thermogravimetry and differential scanning calorimetry. Results show that these additives can greatly improve the EP/AW properties of GH. The XPS analyses of the worn surfaces indicate that decomposed borate esters and organic sulfide or nitrogen were adsorbed on the worn surface, and the P and S elements of the compound reacted with the metal and generated its phosphates and sulfates, both of which contributed t...
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