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A High-Performance Multifunctional Lubricant Additive for Water–Glycol Hydraulic Fluid

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Abstract

A water-soluble boron (B)-containing thiophosphite derivative (BTP) was synthesized, and its tribological, anticorrosion, and antirust properties as an additive for the base liquid of water–glycol hydraulic fluid were evaluated in detail. The results of tests demonstrated that BTP is indeed a high-performance and multifunctional water-soluble lubricant additive that was able to remarkably improve the extreme pressure, friction-reducing, antiwear, anticorrosion, and rust-inhibiting properties of the base liquid when added at a low adding concentration (<3 wt%). Based on a performance comparison of BTP and thiophosphite (TP), whose chemical structure is similar to that of BTP but without B, a number of primary conclusions were drawn. The B element existing as alkanolamine borate group could greatly improve the extreme pressure, antiwear, and antirust performance of BTP, especially the antirust performance, but had only a small effect on the friction-reducing and anticorrosion properties. Based on characterizations and analyses of the worn surfaces, we propose that the antiwear mechanism consists of the prepared compound BTP reacting with the steel surface during the friction process to generate a protective film mainly composed of phosphate, sulfide, sulfate, organic amine, and B2O3.

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Acknowledgments

This work was supported by the Major State Basic Research Development Program of China (973 Program) (Grant No. 2007CB607606).

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Authors and Affiliations

  1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Tianshui Middle Road 18, Lanzhou, 730000, People’s Republic of China

    Junming Wang, Gaiqing Zhao & Xiaobo Wang

  2. Graduate School of Chinese Academy of Sciences, Beijing, 100039, People’s Republic of China

    Junming Wang

  3. Navy Logistical Technical Equipment Research Institute, Beijing, 100072, People’s Republic of China

    Jianhua Wang & Chunsheng Li

Authors
  1. Junming Wang
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  2. Jianhua Wang
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  3. Chunsheng Li
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  4. Gaiqing Zhao
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  5. Xiaobo Wang
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Correspondence to Xiaobo Wang.

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Wang, J., Wang, J., Li, C. et al. A High-Performance Multifunctional Lubricant Additive for Water–Glycol Hydraulic Fluid. Tribol Lett 43, 235–245 (2011). https://doi.org/10.1007/s11249-011-9799-1

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  • DOI: https://doi.org/10.1007/s11249-011-9799-1

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