Tribological Property and Corrosion of Imidazolium-Based Ionic Liquid-Lubricated Steel Sliding Against Anodic Oxide Film on Al-Li Alloy in the Presence of Bubbles Produced by Synergistic Action of Electric Field and Friction

IF 2.9 3区 工程技术 Q2 ENGINEERING, CHEMICAL
Jiawei Cao, Rong Qu, Long Chen, Ruiqing Yao, Jinjun Lu
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Abstract

The tribological property and corrosion of a steel ball sliding against anodic oxide film (AOF) on Al-Li alloy lubricated by an ionic liquid (imidazolium hexafluorophosphate, LP108) are investigated without and with electric field. Upon sliding, no bubbles are observed without electric field (0 V) and with electric field at 1 V, while bubbles are produced continually with electric field at applied voltages of 5 V and 10 V. Higher voltage produces more bubbles. It is found that bubbles accelerate the worn-out of the AOF in sliding and corrosion of the steel ball after sliding. In the absence of bubbles, friction coefficient lower than 0.1 and long wear lifetime suggest that LP108 is a good lubricant at both 0 V and 1 V. In the presence of bubbles, however, AOF is rapidly worn out, i.e., 3.3±0.2 min at 5 V and 1.6±0.3 min at 10 V. Because the bubbles are produced continually at 5 V and 10 V, there is a rapid transition of the lubricating regime from a flooded state (boundary lubrication regime) to a bubble-dominated state (dry sliding regime). By turning off the electric field after one-minute sliding (no more newly born bubbles), the effective lubrication by LP108 can be preserved. Once the tribo-test is ended, the collapse of the bubbles occurs rapidly and hence the corrosion of the steel ball is greatly accelerated when compared to that in the absence of bubbles. In addition to bubble collapse, the bubbles are responsible for the accelerated corrosion of the steel ball because they are the reactive species of electrochemical decomposition of LP108 by synergistic action of electric field and friction, which is supported by experimental evidence. In other words, neither sliding friction without electric field nor electric field without sliding friction up to 10 V produces bubbles. A friction-activated mechanism is proposed to explain the synergistic action of electric field and friction. In short, sliding friction produces wear of the steel ball and this initiates friction activation of the worn surface of the steel ball. Consequently, the generation of bubbles occurs.

Abstract Image

电场和摩擦力协同作用产生气泡时咪唑基离子液体润滑钢在铝锂合金阳极氧化膜上滑动的摩擦学特性和腐蚀性能
研究了在无电场和有电场的情况下,钢球在使用离子液体(六氟磷酸咪唑鎓,LP108)润滑的铝锂合金阳极氧化膜(AOF)上滑动时的摩擦学特性和腐蚀情况。滑动时,在无电场(0 V)和电场电压为 1 V 时均未观察到气泡,而在电场电压为 5 V 和 10 V 时则不断产生气泡。研究发现,气泡加速了滑动过程中 AOF 的磨损和滑动后钢球的腐蚀。在没有气泡的情况下,摩擦系数低于 0.1 且磨损寿命长,这表明 LP108 在 0 V 和 1 V 电压下都是一种良好的润滑剂、由于气泡在 5 V 和 10 V 电压下持续产生,因此润滑状态迅速从淹没状态(边界润滑状态)过渡到以气泡为主的状态(干式滑动状态)。通过在一分钟滑动后关闭电场(不再有新气泡产生),LP108 的有效润滑得以保持。三次试验结束后,气泡迅速溃散,因此钢球的腐蚀速度比没有气泡时大大加快。除了气泡坍塌之外,气泡也是加速钢球腐蚀的原因,因为气泡是 LP108 在电场和摩擦的协同作用下电化学分解的反应物,这一点也得到了实验证据的支持。换句话说,无论是无电场的滑动摩擦,还是高达 10 V 的无滑动摩擦的电场,都不会产生气泡。为解释电场和摩擦的协同作用,提出了一种摩擦激活机制。简而言之,滑动摩擦使钢球产生磨损,从而引发钢球磨损表面的摩擦活化。因此,产生了气泡。
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来源期刊
Tribology Letters
Tribology Letters 工程技术-工程:化工
CiteScore
5.30
自引率
9.40%
发文量
116
审稿时长
2.5 months
期刊介绍: Tribology Letters is devoted to the development of the science of tribology and its applications, particularly focusing on publishing high-quality papers at the forefront of tribological science and that address the fundamentals of friction, lubrication, wear, or adhesion. The journal facilitates communication and exchange of seminal ideas among thousands of practitioners who are engaged worldwide in the pursuit of tribology-based science and technology.
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