Abstract
Ammonium tetrathiomolybdate ((NH4)2MoS4) is usually used as a precursor for preparing MoS2 nanomaterials. Herein, we added (NH4)2MoS4 to water-glycerol mixture containing choline ricinoleate ionic liquid ([cho][ricinoleate]) and investigated the impact of (NH4)2MoS4 on the tribological behavior of [cho][ricinoleate] in water-glycerol mixture considering different factors including concentration, load, and temperature. There are significant synergistic effects between (NH4)2MoS4 and [cho][ricinoleate] on the lubricity: a small amount of (NH4)2MoS4 can remarkably enhancing the antiwear and friction-reducing properties of [cho][ricinoleate] in water-based fluid, and the optimal concentration of (NH4)2MoS4 is 0.01%. The antiwear capability of the optimal formulation increases with the increase of temperature and load. We further carried out SEM–EDS, Raman, and XPS analyses of the wear tracks to investigate the underlying lubrication mechanism. The dominant improvement of (NH4)2MoS4 on the lubricating ability of [cho][ricinoleate] in water-glycerol mixture is ascribed to the generation of the stable hybrid tribofilm consisting of the carbon film, MoS2, FeS2, and Mo oxides.
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The authors are grateful to National Key Research and Development Program of China (Grant No. 2018YFB0703802).
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Zheng, D., Ju, C., Zhao, Q. et al. Ammonium Tetrathiomolybdate Enhancing the Lubricity of Choline Ricinoleate Ionic Liquid in Water–Glycerol Mixture. Tribol Lett 67, 122 (2019). https://doi.org/10.1007/s11249-019-1234-z
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DOI: https://doi.org/10.1007/s11249-019-1234-z