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

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. Ev...

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Published inFriction Vol. 9; no. 2; pp. 344 - 355
Main Authors Yu, Qiangliang, Zhang, Chaoyang, Dong, Rui, Shi, Yijun, Wang, Yurong, Bai, Yanyan, Zhang, Jiaying, Cai, Meirong, Zhou, Feng, Liu, Weimin
Format Journal Article
LanguageEnglish
Published Beijing Tsinghua University Press 01.04.2021
Springer Nature B.V
Lubricating Oil Key Laboratory of Petro China,Lanzhou Lubricating Oil Research&Development Institute of Petro China,Lanzhou730060,China%State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China%State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China
Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China%Division of Machine Elements,Lule?University of Technology,Lule?97187,Sweden
State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China
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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.
AbstractList 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.
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.
Author Dong, Rui
Zhou, Feng
Yu, Qiangliang
Shi, Yijun
Wang, Yurong
Cai, Meirong
Zhang, Jiaying
Zhang, Chaoyang
Bai, Yanyan
Liu, Weimin
AuthorAffiliation 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,Lanzhou730060,China%State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China%State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China%Division of Machine Elements,Lule?University of Technology,Lule?97187,Sweden
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Keywords dicationic ionic liquids (ILs)
tribofilm
halogen-free
lubricant
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Lubricating Oil Key Laboratory of Petro China,Lanzhou Lubricating Oil Research&Development Institute of Petro China,Lanzhou730060,China%State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China%State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China
Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China%Division of Machine Elements,Lule?University of Technology,Lule?97187,Sweden
State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China
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Snippet A series of new halogen-free dicationic ionic liquids (ILs) with different alkyl chain lengths were prepared, and the relationship between the alkyl chain...
Abstract A series of new halogen-free dicationic ionic liquids (ILs) with different alkyl chain lengths were prepared, and the relationship between the alkyl...
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SubjectTerms Chains
Contact resistance
Corrosion and Coatings
Corrosion tests
dicationic ionic liquids (ILs)
Electric contacts
Engineering
Friction
Friction reduction
halogen-free
Ionic liquids
Ions
lubricant
Lubricants
Machine Elements
Maskinelement
Mechanical Engineering
Mechanical properties
Nanotechnology
Photoelectrons
Physical Chemistry
Research Article
Stability analysis
Surfaces and Interfaces
Thin Films
tribofilm
Tribology
Ultrasonic testing
Wear
X ray photoelectron spectroscopy
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Title Physicochemical and tribological properties of gemini-type halogen-free dicationic ionic liquids
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Volume 9
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