Tribological performance “recovery” caused by the addition of ionic liquid to used engine oil

被引：0
|
作者：
Da-Tong Z. [1 ]
Shu-Yan Y. [1 ,2 ]
Mei-Rong C. [2 ]
Feng G. [1 ]
机构：
[1] School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao
[2] State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou
来源：
Surface Technology | 2021年 / 50卷 / 09期
基金：
中国国家自然科学基金;
关键词：
Film formation property; Friction and wear; Ionic liquid; Oil recovery; Starvation;
D O I：
10.16490/j.cnki.issn.1001-3660.2021.09.020
中图分类号：
学科分类号：
摘要：
This paper aims to explore the influence of ionic liquid on the tribological performance of used engine oil. After the evaluation for the influence of additives on friction by a four-ball experimental machine, the morphology and surface chemical composition of the wear scars are characterized by SEM, EDS and roughness profiler, and the influence of additives on film formation was studied by a measurement device of point contact light interference oil film thickness. After adding the ionic liquid, at 40 ℃ and 100 ℃, the friction coefficients are lower than those of used oil, which are about 0.095 and 0.085 respectively. Especially at 100 ℃, the friction coefficient (≈0.085) is lower than that of fresh lubrication oil (≈0.09) and the diameter of the wear scar is also reduced. Besides, under the conditions of “light” and “severe” starvation of elastohydrodynamic lubrication (Starved EHL), adding IL to the used engine oil can get better film formation and increase about 20 nm center film thickness. After the addition of IL to the lubricated boundary, the used engine oil has regained good friction and wear performance. During the friction process at high temperature, IL undergoes a complex chemical reaction on the metal surface to form a low shear strength reaction film; In the state of starvation, the oil-based additive IL has a strong polarity and it is easy to form a stable adsorption film on the contact surface, which changes the pressure distribution of the lubricating oil on the contact area and causes the effective viscosity of the lubricating oil in the inlet area to be much greater than its the apparent viscosity, so it improves the film-forming ability of used oil, thereby regaining better lubricating performance. © 2021, Chongqing Wujiu Periodicals Press. All rights reserved.
引用
收藏
页码：196 / 204
页数：8
相关论文
共 15 条
  • [1] Jian-Fang L., Research on the Classification Regeneration Method and Tribological Performance of Recovered Lubricating Oils[D], (2014)
  • [2] Wei W., What is the cause of lubricant failure [J], Petroleum Knowledge, 4, (2019)
  • [3] Hong-Wei Y., Yi-Wei F., Jian-Qiang H., The recycling of used lubricating oil at home and abroad[J], Lubricating Oil, 21, 6, pp. 9-11, (2006)
  • [4] Fauser F., Ritz W., RECYCLON-A new method of re-refining spent lubrication oils without detriment to the environment[J], Conservation & Recycling, 3, 2, pp. 135-141, (1979)
  • [5] Kajdas C., Major pathways for used oil disposal and recycling. Part 2[J], Tribotest, 7, 2, pp. 137-153, (2000)
  • [6] Shu-Rong W., Yue-Ling G., Qian L., Et al., Separation of bio-oil by molecular distillation[J], Fuel Processing Technology, 90, 5, pp. 738-745, (2009)
  • [7] Da-Peng X., Hou-Chun Y., Yuan-Yuan H., Et al., Status of waste lubricating oil regeneration technology[J], Applied Chemical Industry, 49, 9, pp. 2334-2336, (2020)
  • [8] Bermudez M.D., Jimenez A.E., Sanes J., Et al., Ionic liquids as advanced lubricant fluids[J], Molecules, 14, 8, pp. 2888-2908, (2009)
  • [9] Feng Z., Yong-Min L., Wei-Min L., Designed chemistry for engineering applications[J], Chemical Society Reviews, 38, 9, pp. 2590-2599, (2009)
  • [10] Li J.-S., Yong-Gang W., Tian-Hui R., A survey on the substitute for ZDDP[J], Lubrication Engineering, 31, 8, pp. 168-172, (2006)
12