Ong, Chiu Ling and Lai, Yew Chong and Tang, Wai Kit and Heidelberg, Thorsten and Khaligh, Nader Ghaffari and Juan, Joon Ching (2024) Tribological behavior of sulfonitrided tribofilm generated from non-corrosive dimercaptobenzothiadiazole-based additives as effective boundary lubrication layer. Journal of Molecular Liquids, 403. p. 124751. ISSN 0167-7322, DOI https://doi.org/10.1016/j.molliq.2024.124751.
Full text not available from this repository.Abstract
Lubricant additives are essential to protect mechanical devices. Although sulfur (S)-based dialkylpentasulfide (RC2540) exhibits acceptable extreme pressure (EP) performance, a high amount of S causes severe corrosion and poorer anti-wear (AW) performance. Herein, dimercaptobenzothiadiazole-based additives (DMTDs) consist of four and five S atoms, namely 2-(benzyldisulfanyl)-5-(benzylsulfanyl)-1,3,4-thiadiazole (4SBZ), 2-(octyldisulfanyl)-5-(octylsulfanyl)-1,3,4-thiadiazole (4SC8), 2,5-bis(benzyldisulfanyl)-1,3,4-thiadiazole (5SBZ), and 2,5bis(octyldisulfanyl)-1,3,4-thiadiazole (5SC8) were synthesized. The synthesized DMTDs are non -corrosive (Grade 1a -1b) compared to RC2540 (Grade 4c). The 10 wt% 5SBZ demonstrated exceptional EP and AW performance than RC2540. The 10 wt% 5SBZ has improved weld load and reduced wear scar area by 5.0 folds and 94.1% compared to naphthenic base oil. The exceptional tribological properties of 5SBZ are attributed to the strong noncovalent interaction between the benzene ring and metal surfaces, high S content, and synergistic effect between S and N. Alternatively, the DMTDs exhibit better AW performance compared to RC2540. The XPS depth profiling demonstrated the formation of sulfonitrided tribofilm after lubrication with synthesized DMTDs. This tribofilm contributed to an excellent boundary lubrication layer for wear protection. The lubrication mechanism was discussed and proposed. This work provides promising DMTDs as EP and AW additives for industrial applications.
| Item Type: | Article |
|---|---|
| Funders: | Research Management Centre (RMC) of Universiti Malaya (ST022-2023) |
| Uncontrolled Keywords: | Dimercaptobenzothiadiazole; Non -corrosive; Naphthenic base oil; Dialkylpentasulfide; Sulfonitrided tribofilm; Lubrication mechanism |
| Subjects: | Q Science > Q Science (General) Q Science > QC Physics Q Science > QD Chemistry |
| Divisions: | Faculty of Science > Department of Chemistry Deputy Vice Chancellor (Research & Innovation) Office > Nanotechnology & Catalysis Research Centre |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 26 Sep 2024 01:47 |
| Last Modified: | 26 Sep 2024 01:47 |
| URI: | http://eprints.um.edu.my/id/eprint/45196 |
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