Citation: MA Hai-Bing, LI Jing, YU Yi, ZUO Guang-Zhi, REN Tian-Hui. Tribological Behaviors and Film Analysis of Two Ashless Phosphorus/Sulfur-Containing Additives in Rapeseed Oil[J]. Acta Physico-Chimica Sinica, ;2008, 24(05): 799-804. doi: 10.3866/PKU.WHXB20080511
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Two synthetical ashless phosphorus/sulfur-containing compouds were used as additives in biodegradable rapeseed oil (RSO). Their anti-wear and friction-reduction performances as lubricating oil additives were evaluated using four-ball tester. The chemistry of their tribofilms and thermal films was analyzed with X-ray photoelectron spectroscopy (XPS) and X-ray absorption near-edge spectroscopy (XANES), The results showed that the two phosphorus/sulfur-containing compounds possessed rather od anti-wear properties and friction-reducing performances. According to the XPS and XANES analytic results, the tribofilms and thermal films generated from the additives were mainly composed of adsorbed-film and reaction film, in which phosphate and pyrophosphate were main existence form of P, FeSO4 was the main existence form of S. The results also showed that tribo-heat played different roles in the formation of tribofilms generated fromthe two different additives.
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