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      Tribological study of N-containing borate derivatives and their synergistic antioxidation effects with T531

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          Abstract

          Two N-containing borates, BTES and BMES, were synthesized with dodecyl phenol, 2-(N-containing heterocyclic) ethan-1-ol, boric acid, and dibutylamine, and their tribological properties in rapeseed oil (RSO) were investigated using a four-ball tester. The results showed that the load-carrying ability ( P B value) of RSO can be improved by 40.9% and 67.9%, respectively, when using 0.5 wt% BTES and BMES. Moreover, the antiwear and friction-reducing performances of the additive-containing oils increased with the additive concentration. The X-ray photoelectron spectroscopy results of the worn steel ball surfaces showed that BTES and BMES formed protective films, which contained boron oxide, iron oxide, ferrous sulfate, ferrous sulfide (for BMES), and other organic nitrogen compounds, on the metal surfaces. The better load-carrying and antiwear performances of BMES than those of BTES might be due to their different sulfur contents, which result in different tribochemical reaction films on the contact surfaces. The oxidation stability tests showed that BTES and BMES possessed synergistic antioxidation activity with N-phenyl-α-naphthylamine (T531), and consequently, the oxidation activation energy of the oil sample increased by 77.85% and 82.19%, respectively, compared with that of RSO when the oil sample contained 0.05 wt% BTES/BMES and 0.25% T531.

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          Author and article information

          Contributors
          Journal
          Friction
          Friction
          Tsinghua University Press (Beijing/Hong Kong )
          2223-7704
          2223-7690
          01 October 2019
          01 October 2019
          : 7
          : 5
          : 417-431
          Affiliations
          1School of Materials Science and Engineering, East China Jiaotong University, Nanchang 330013, China
          2Department of Aviation Oil and Material, Air Force Logistics College, Xuzhou 222100, China
          3Shanghai Applied Technology University, Shanghai 201418, China
          4School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
          Author notes
          *Corresponding author: Zhongyi HE, E-mail: hzy220567@ 123456163.com ; Shaoming YANG, E-mail: yangsm79@ 123456163.com
          Article
          s40544-018-0216-8
          10.1007/s40544-018-0216-8
          Copyright © Journals of Tsinghua University Press

          This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 Unported License (CC BY-NC 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. See https://creativecommons.org/licenses/by-nc/4.0/.

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