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The Tribological Chemistry of the Oil Blends of Zinc Dialkyldithiophosphate with 2-Mercaptobenzothiazole Derivatives

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Abstract

X-ray absorption near-edge spectroscopy at the phosphorous and sulfur edges was used to identify the chemical species in thermal films and antiwear films on the macroscale. For the thermal films, it was found that the introduction of the additive MBTT/MBTA to the base oil, zinc dialkyldithiophosphate (ZDDP), tended to retard the formation of the polyphosphate, and has no effect on the thickness of the films. The topmost surface thermal films may be mainly comprised of some new compounds generated from the interaction of ZDDP with the antiwear additives MBTT/MBTA, along with a small amount of unchanged ZDDP, the sub-surface, and the bulk were mainly comprised of Zn phosphate, along with an amount of ZnS. For the antiwear films, the introduction of the additive MBTT/MBTA to the base oil, ZDDP, reduces the chain length of polyphosphate, which the N-containing decomposed products of 2-mercaptobenzothiazole derivatives are responsible for. It is very clear that MBTT or MBTA has indeed interacted with ZDDP to form new phosphate in the overall antiwear films. The topmost surface antiwear films were mainly comprised of short-chain polyphosphate, the sub-surface and the bulk may be mainly comprised of Zn phosphate and ZnS.

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Acknowledgments

The authors are grateful to the open projects of the Key State Lab of Solid Lubrication in Lanzhou of China (Grant No. 0806) and the staff at the CSRF and Synchrotron Radation Centra (SRC), University of Wisconsin, Madison, for their technical support and the National Foundation (NSF) for supporting the SRC under Award #0537588.

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Shanghai Jiaotong University, Shanghai, 200240, People’s Republic of China

    Hua Wu, Tianhui Ren & Guangzhi Zuo

  2. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Science, Lanzhou, 730000, People’s Republic of China

    Hua Wu

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  1. Hua Wu
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  2. Tianhui Ren
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Correspondence to Hua Wu.

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Wu, H., Ren, T. & Zuo, G. The Tribological Chemistry of the Oil Blends of Zinc Dialkyldithiophosphate with 2-Mercaptobenzothiazole Derivatives. Tribol Lett 35, 171–179 (2009). https://doi.org/10.1007/s11249-009-9446-2

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  • DOI: https://doi.org/10.1007/s11249-009-9446-2

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