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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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Friction-condition-dependent sulfide and sulfate evolution on dialkylpentasulfide tribofilm studied by XANES

Show Author's information Ganlin ZHENG1Tongmei DING1Songhong PANG1Lei ZHENG2Tianhui REN1( )
Key Laboratory for Thin Film and Microfabrication of the Ministry of Education, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China

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.

Keywords: sulfur, X-ray absorption near-edge structure (XANES), friction condition, tribochemical process

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Publication history

Received: 16 November 2018
Revised: 15 January 2019
Accepted: 11 May 2019
Published: 27 August 2019
Issue date: October 2020

Copyright

© The author(s) 2019

Acknowledgements

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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