Abstract
Two novel disulfide-type triazine derivatives, 6,6'-disulfanediylbis(4-(dibutylamino)-1,3,5-triazine-2-thiol) (coded DTBT) and 6,6'-disulfanediylbis(4-(bis(2-ethylhexyl)amino)-1,3,5-triazine-2-thiol) (coded DTOT), were prepared. A four-ball tester was used to evaluate their tribological performances as anti-wear and extreme-pressure additives in biodegradable lithium grease. The results show that the disulfide-type triazine derivatives possess good friction-reducing properties and excellent anti-wear, extreme-pressure capacities. For further understanding of their tribological behaviors, X-ray photoelectron spectroscopy and scanning electron microscopy are adopted to analyze the tribofilms generated from these additives in biodegradable lithium grease. The results of X-ray photoelectron spectroscopy analysis illustrate that the prepared compounds as additives in biodegradable lithium grease forms a protective film containing FeS, FeS2 (or S-containing organic compounds), Fe2(SO4)3, FeSO4, FeO (or Fe3O4), and N-containing organic compounds on the metal surface during the sliding process.
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More From: Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology
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