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Friction 2021, 9(2): 344-355 https://doi.org/10.1007/s40544-019-0348-5
Research Article | Open Access | Issue | Published: 15 July 2020

Physicochemical and tribological properties of gemini-type halogen-free dicationic ionic liquids

Show Author's Information Qiangliang YU1,2,  Chaoyang ZHANG1,  Rui DONG1,3,  Yijun SHI4,  Yurong WANG1,3,  Yanyan BAI1,3,  Jiaying ZHANG1,3,  Meirong CAI1( ),  Feng ZHOU1( ),  Weimin LIU1
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
Lubricating Oil Key Laboratory of Petro China, Lanzhou Lubricating Oil Research & Development Institute of Petro China, Lanzhou 730060, China
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
Division of Machine Elements, Luleå University of Technology, Luleå 97187, Sweden
Keywords:
lubricant, tribofilm, halogen-free, dicationic ionic liquids (ILs)
Cite this article:
YU Q, ZHANG C, DONG R, et al. Physicochemical and tribological properties of gemini-type halogen-free dicationic ionic liquids. Friction, 2021, 9(2): 344-355. https://doi.org/10.1007/s40544-019-0348-5
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Abstract Full text Electronic supplementary material About this article

A series of new halogen-free dicationic ionic liquids (ILs) with different alkyl chain lengths were prepared, and the relationship between the alkyl chain length, physicochemical and tribological properties of ILs, and their role as neat lubricant for steel-steel friction pairs, was investigated. Evaluation of stability during hydrolysis and copper strip corrosion test results show that synthetic ILs are stable and not corrosive to metal contacts, due to the halogen-free anions. The friction and wear test results indicate that ILs with long alkyl chains have excellent friction-reducing and anti-wear properties, especially at high temperatures. Based on the surface three-dimensional (3D) profiles, electrical contact resistance, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and the X-ray photoelectron spectrometry (XPS) analysis of the worn surfaces of steel discs, we can conclude that the efficiency of ILs is due to the formation of high quality tribofilms that consist of both tribochemical reaction and ordered absorption films.


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About this article

Physicochemical and tribological properties of gemini-type halogen-free dicationic ionic liquids

Show Author's information Qiangliang YU1,2, Chaoyang ZHANG1, Rui DONG1,3, Yijun SHI4, Yurong WANG1,3, Yanyan BAI1,3, Jiaying ZHANG1,3, Meirong CAI1( ), Feng ZHOU1( ), Weimin LIU1
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
Lubricating Oil Key Laboratory of Petro China, Lanzhou Lubricating Oil Research & Development Institute of Petro China, Lanzhou 730060, China
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
Division of Machine Elements, Luleå University of Technology, Luleå 97187, Sweden

Abstract

A series of new halogen-free dicationic ionic liquids (ILs) with different alkyl chain lengths were prepared, and the relationship between the alkyl chain length, physicochemical and tribological properties of ILs, and their role as neat lubricant for steel-steel friction pairs, was investigated. Evaluation of stability during hydrolysis and copper strip corrosion test results show that synthetic ILs are stable and not corrosive to metal contacts, due to the halogen-free anions. The friction and wear test results indicate that ILs with long alkyl chains have excellent friction-reducing and anti-wear properties, especially at high temperatures. Based on the surface three-dimensional (3D) profiles, electrical contact resistance, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and the X-ray photoelectron spectrometry (XPS) analysis of the worn surfaces of steel discs, we can conclude that the efficiency of ILs is due to the formation of high quality tribofilms that consist of both tribochemical reaction and ordered absorption films.

Keywords: lubricant, tribofilm, halogen-free, dicationic ionic liquids (ILs)

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Publication history
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Publication history

Received: 21 January 2019
Revised: 31 July 2019
Accepted: 03 December 2019
Published: 15 July 2020
Issue date: April 2021

Copyright

© The author(s) 2019

Acknowledgements

The authors acknowledge financial support from the National Key Research and Development Program of China (2018YFB0703802), the National Natural Science Foundation of China (Grant Nos. 51705504, 21972153, and 51675512), the China Postdoctoral Science Foundation Funded Project (2019M653798), the Youth Innovation Promotion Association of CAS (2018454), the pre-research project in the manned space field (040101), and the Gansu Province Science and Technology Plan (18ZD2WA011).

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