Abstract
The effects of friction conditions, such as rotational speed, frictional time, and applied load, on the evolution mechanism of sulfide and sulfate on the top and bottom layers of tribofilm were investigated by total electron yield (TEY) and fluorescence yield (FY) mode X-ray absorption near-edge structure (XANES) spectra in the same beam line (4B7A). The results demonstrated that the top and bottom layers of tribofilms were covered by sulfide and sulfate. The addition of dialkylpentasulfide (DPS) could form complex nonuniform tribofilm. In addition, the friction condition (speed, load, or time) has its unique role in the generation of sulfide and sulfate at a specific depth on the tribofilm surface. The enhancement of friction conditions could promote the sulfur tribochemical reaction in a comparatively large range and alter the relative intensity of sulfurization and the sulfur-oxidizing process.
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The authors are grateful to the National Natural Science Foundation of China (Grant No. 51875342) and Beijing Synchrotron Radiation Facility (Grant No. SR06033), for the financial support of this work.
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Tianhui REN. He received his bachelor degree in petrochemistry in 1987, and master degree in organometallic chemistry in 1990 from Lanzhou University. After then, he obtained his Ph.D. degree under the guidance of Qunji Xue (academician) in Lanzhou Insititute of Chemical Physics, Chinese Academy of science. He got a lecturer position at East China Jiao Tong University in 1993 and was appointed as a professor in 1999. Then, he joined School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University in August 1999, and has been working as a professor at the Functional Organic and Interfacial Materials ever since. His research interests cover environmental-friendly fuel and lubricating oil additives, oil and water separation materials, biological and human muscle tissue lubrication materials, photoelectric organic materials, and pharmaceutical pesticide intermediates.
Ganlin ZHENG. He received his master degree in pharmaceutical engineering and technology from East China University of Science and Technology, Shanghai, China, in 2015. After then, he studied as a Ph.D. student in the Key Laboratory of Thin Film and Microfabrication Technology (Ministry of Education) at Shanghai Jiao Tong University, China, where he has recently obtained his Ph.D. degree. His research interests include the mechanism of lubricating additives, the development of novel surfactants, and development of medical biomaterials.
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Zheng, G., Ding, T., Pang, S. et al. Friction-condition-dependent sulfide and sulfate evolution on dialkylpentasulfide tribofilm studied by XANES. Friction 8, 874–881 (2020). https://doi.org/10.1007/s40544-019-0303-5
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DOI: https://doi.org/10.1007/s40544-019-0303-5