NDLI: Effect of Imidazolium Ionic Liquid Additives on Lubrication Performance of Propylene Carbonate under Different Electrical Potentials

Content Provider	Springer Nature Link
Author	Yang, Xiaoyong Meng, Yonggang Tian, Yu
Copyright Year	2014
Abstract	Three different ionic liquids (ILs), 1-octyl-3-methylimidazolium tetrafluoroborate ([OMIm]BF$_{4}$), 1-octyl-3-methylimidazolium hexafluorophosphate ([OMIm]PF$_{6}$) and 1-decyl-3-methylimidazolium hexafluorophosphate ([DMIm]PF$_{6}$), were used as additives in the base ester propylene carbonate (PC) for the lubrication of AISI 4340 steel surfaces. Ball-on-disk friction tests were done under different electrical potentials to investigate the synergetic effect of IL concentration and electrical potential on lubrication performance, and electrochemical and ellipsometric tests were conducted to explore the adsorption of IL additives at different potentials. The friction reduction and anti-wear performance of the tested three IL/PC solutions illustrated similar dependence on electrical potential. In the potential range from −0.6 to +0.6 V, friction coefficient increases rapidly. When the potential is more negative than −0.6 V, friction coefficient is at the lower level of about 0.13. When the potential is greater than +0.6 V, friction coefficient is at the higher level of about 0.2. The electrochemical test results show that [DMIm]PF$_{6}$/PC solution is the lowest in corrosion against AISI 4340 steel among the three tested lubricants. The wear of steel surface in 0.5 mM [DMIm]PF$_{6}$/PC solution is reduced when electrical potential is shifted to −1.0 V comparing with that at open-circuit potential. The potential-dependent friction and wear behaviors are explained in terms of the variation of the adsorbed ion species and the surface concentration of the adsorbed ions under different additive concentration and electrical potential conditions.
Starting Page	161
Ending Page	169
Page Count	9
File Format	PDF
ISSN	10238883
Journal	Tribology Letters
Volume Number	56
Issue Number	1
e-ISSN	15732711
Language	English
Publisher	Springer US
Publisher Date	2014-08-20
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ionic liquids Additive Lubrication Adsorption Electrical potential Steel Tribology, Corrosion and Coatings Surfaces and Interfaces, Thin Films Theoretical and Applied Mechanics Physical Chemistry Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Mechanics of Materials Mechanical Engineering Surfaces and Interfaces

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