Lubricating mechanism of cyano-based ionic liquids on nascent steel surface. (March 2018)

• Record Type: Journal Article
• Authors: Kawada, S.; Watanabe, S.; Tadokoro, C.; Tsuboi, R.; Sasaki, S.
• Is Part Of: Tribology international. Volume 119(2018)
• Page Start: 474
• Page End: 480
• Publication Date: 2018-03
• Subjects: Q-MS -- ToF-SIMS -- TGA -- Ionic liquids; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2017.11.019
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: This study investigates the lubricating mechanism of cyano-based ionic liquids on steel surfaces using Q-MS, ToF-SIMS, and TGA. [EMIM][DCN], [EMIM][TCC], [EMIM][TCB], [BMPL][DCN], [BMPL][TCC], and [BMPL][TCB] were selected as lubricants. [EMIM][TCB] exhibited the highest friction coefficient. The others exhibited very low friction coefficients of less than 0.08. Q-MS analysis indicated that the cation components were detected in outgassing during sliding tests. However, anion components were not detected. ToF-SIMS results showed that the anions remained on the worn surfaces which would lead low friction coefficients. To achieve low friction coefficient, the tribo-decomposition of the ionic liquids and adsorption of anion were required. TGA indicated thermal stability was an index for tribo-decomposition on the nascent steel surface. Highlights: The lubricating mechanism of cyano-based ionic liquids was investigated. Q-MS results indicated that cation components were detected in outgassing. ToF-SIMS results indicated the adsorption of anion was confirmed in the case of low friction coefficient. The thermal stability of ionic liquids can become an index for tribo-decomposition on the nascent surface.