Effect of sulfur on the hydrolytic stability and tribological properties of N-containing borate ester

Yinglei Wu*, Emile van der Heide, Zhongyi He

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Two borate esters, one with benzotriazole (BTB) and another with 2-mercaptobenzothiazole (BMB) were synthesized and used as additives in mineral oil. BMB showed better hydrolysis stability, probably because S atoms in BMB provided negative charges to the N to enhance B←N coordination. Moreover, BMB was superior in terms of improving PB value, anti-wear and friction-reducing properties of mineral oil. XPS spectra revealed that h-BN, B2O3 and FexOy were detected in BTB-tribofilm, while additional FeSO4, FeS and B2S3 were found in BMB-tribofilm. The possible triple effects of S atoms in BMB can be summarized as: enhancing the B←N coordination; improving the adsorption ability of BMB on the metal surface; and generating tribochemical reaction products with tribological effects.

Original languageEnglish
Article number204433
JournalWear
Volume504-505
Early online date5 Jul 2022
DOIs
Publication statusPublished - 15 Sep 2022

Keywords

  • Hydrolysis stability
  • N-containing borate ester
  • Quantum chemical computations
  • Tribological mechanisms
  • 22/3 OA procedure

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