PREPARATION AND TRIBOLOGICAL PROPERTIES OF SULFURETED OLEIC ACID DERIVATIVES AS LUBRICANT ADDITIVES TO POLY ALPHA OLEFIN

摘要

Two sulfureted oleic acid derivatives, named SBO and SOO, respectively, were synthesized and characterized. The tribological properties of SBO, SOO as additives to base oil (PAO) were tested by a four-ball machine. The results showed that SBO had some excellent load-carrying capacities, good anti-wear and friction-reducing properties under the full test conditions. When the PAO contained 0.75% SBO, the wear scar diameter and the friction coefficient were reduced by 73% and 69%, respectively. The surface morphology and the elemental composition of the tribofilms, lubricated by SBO and SOO, were investigated using scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS). The results showed that a tribological protective film, containing FeOx and FeSO4, had been formed under boundary lubricating conditions during friction.