Tribochemistry of mercaptoimidazoline as an additive in emulsion between self-mated GCr15 ball interfaces and its friction-reduction mechanism

IF 2 3区材料科学 Q2 ENGINEERING, MECHANICAL

Surface Topography: Metrology and Properties Pub Date : 2023-11-14 DOI:10.1088/2051-672x/ad0ca0

Sier Kuang, Xiaoya Sun, Liping Xiong, Yinglei Wu, Lili Li, Lei Guo, zhongyi He, Renhui Zhang

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Abstract

Abstract The tribological properties of two mercaptoimidazolines, with amino (2-MBTA) and hydroxyl (2-MBTD) functional groups, as lubricating additives in a water-based rapeseed oil emulsion were investigated. The results of tribological tests on a four-ball tester showed that both mercaptoimidazolines had effective anti-wear and friction reduction properties. The optimal tribological performance of the 2-MBTD was found to be 98 N and could be scribed to the hydroxyl group, whereas the amino group in 2-MBTA created a more effective wear-reducing tribofilm on the rubbing surfaces at 294 N. EDS analysis on the worn surface areas showed that the difference in tribological properties between 2-MBTA and 2-MBTD was attributed to the different contents of the active elements N and S. In addition, XPS results indicated that sulfates were prevalent in the tribofilm for 2-MBTA, whereas sulfides that could reduce the coefficient of friction (COF) were present in the tribofilm for 2-MBTD. The friction mechanism of 2-MBTA and 2-MBTD is that different functional groups influence the composition of the boundary lubrication film formed, which in turn affects the tribological properties of the additives.

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巯基咪唑啉作为自配GCr15球界面乳化液中的摩擦化学及其减摩机理

摘要研究了两种氨基(2-MBTA)和羟基(2-MBTD)巯基咪唑啉作为水基菜籽油乳液润滑添加剂的摩擦学性能。在四球试验机上进行的摩擦学试验结果表明，两种巯基咪唑类化合物均具有有效的抗磨减摩性能。2-MBTD的摩擦学性能在98 N时达到最佳，并可被描述为羟基，而2-MBTA的氨基在294 N时形成了更有效的摩擦膜，磨损表面的EDS分析表明，2-MBTA和2-MBTD的摩擦学性能差异是由于活性元素N和s的含量不同。XPS结果表明，2-MBTA摩擦膜中主要存在硫酸盐，而2-MBTD摩擦膜中主要存在降低摩擦系数的硫化物。2-MBTA和2-MBTD的摩擦机理是不同官能团影响所形成的边界润滑膜的组成，进而影响添加剂的摩擦学性能。

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来源期刊

Surface Topography: Metrology and Properties Materials Science-Materials Chemistry

CiteScore

4.10

自引率

22.20%

发文量

183

期刊介绍： An international forum for academics, industrialists and engineers to publish the latest research in surface topography measurement and characterisation, instrumentation development and the properties of surfaces.