Abstract
A type of boron‐sulphur‐modified rape seed oil for use as a lubricant additive was prepared. The tribological properties of the additive in rape seed oil were evaluated using a friction tester. The morphologies and tribochemical species of the worn surfaces of the test balls were analysed by means of X‐ray photo‐electron spectroscopy. The results show that the additive is very good in increasing the load‐carrying capacity and improving the antiwear and friction‐reducing properties of a rape seed base oil. The inferred lubrication mechanism is that a high‐strength adsorption film and a tribochemical reaction film form on rubbing surfaces due to the carrier effect of the long‐chain fatty acid molecules, to the high reactivities of sulphur and boron, and to the electron deficiency of boron, and their synergism.
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