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

作　　者：Qiangliang YU Chaoyang ZHANG Rui DONG Yijun SHI Yurong WANG Yanyan BAI Jiaying ZHANG Meirong CAI Feng ZHOU Weimin LIU 

机构地区：[1]State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China [2]Lubricating Oil Key Laboratory of Petro China,Lanzhou Lubricating Oil Research&Development Institute of Petro China,Lanzhou 730060,China [3]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China [4]Division of Machine Elements,LuleåUniversity of Technology,Luleå97187,Sweden

出　　处：《Friction》2021年第2期344-355,共12页摩擦（英文版）

基　　金：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);the Gansu Province Science and Technology Plan(18ZD2WA011).

摘　　要：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.

关 键 词：HALOGEN-FREE dicationic ionic liquids(ILs) lubricant TRIBOFILM 

分 类 号：TH117[机械工程—机械设计及理论]