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Two novel ashless and non-phosphorus S,B-containing morpholine derivatives,MBOCand MBOD,were prepared and their tribological behaviors in rapeseed oil (RSO) were evaluatedusing a four-ball tester.Thermal degradation tests were conducted to identify their thermal stabili-ties using a thermo-gravimetric analyzer.The worn surfaces of the steel balls were investigated byscanning electron microscopy (SEM).The results indicated that the additives possessed high ther-mal stabilities and good load-carrying capacities.Moreover,they both had good anti-wear and fric-tion reducing property at a relatively high concentration (1.5 m%) and under all test loads.The re-sults of XPS analyses illustrated that the prepared compounds as additives in RSO could form aprotective film containing inorganic sulfide,sulfate,oxidized compounds and organic nitrogen-con-taining compounds on the metal surface during the sliding process.
Two novel ashless and non-phosphorus S, B-containing morpholine derivatives, MBOCand MBOD, were prepared and their tribological behaviors in rapeseed oil (RSO) were evaluated using a four-ball tester. Thermal degradation tests were conducted to identify their thermal stabili-ties using a thermo-gravimetric analyzer. The worn surfaces of the steel balls were investigated byscanning electron microscopy (SEM). The results indicated that the additive possessed high ther-mal stabilities and good load-carrying capacities. More than that, they both had good anti- wear and fric-tion reducing property at a relatively high concentration (1.5 m%) and under all test loads.The re-sults of XPS analyzes illustrate that the prepared compounds as additives in RSO could form aprotective film containing inorganic sulfide, sulfate, oxidized compounds and organic nitrogen-con-taining compounds on the metal surface during the sliding process.