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Lubrication performance of an ammonium cation-based ionic liquid used as an additive in a polar oil

This paper studies the tribological behavior of the ionic liquid methyltrioctylammonium bis(trifluoromethylsulfonyl)imide ([N1888][NTf2]) as additive at different concentrations (1.25, 2.50, 3.75 and 5.00 wt%) in a polar base oil (diester). A tribometer using a ball-on-disk reciprocating configurati...

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Bibliographic Details
Published in:Tribology international 2017-12, Vol.116, p.422-430
Main Authors: Viesca, J.L., Mallada, M.T., Blanco, D., Fernández-González, A., Espina-Casado, J., González, R., Hernández Battez, A.
Format: Article
Language:English
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Summary:This paper studies the tribological behavior of the ionic liquid methyltrioctylammonium bis(trifluoromethylsulfonyl)imide ([N1888][NTf2]) as additive at different concentrations (1.25, 2.50, 3.75 and 5.00 wt%) in a polar base oil (diester). A tribometer using a ball-on-disk reciprocating configuration under fully flooded lubrication was used at a frequency of 15 Hz, at three different loads (40, 80 and 120 N), stroke length of 4 mm, and duration of 45 min. Worn surface on the disk was studied by confocal microscopy, SEM and XPS. Main results showed similar coefficient of friction for all lubricant samples; but different wear results were found at different loads, probably related with the chemical states found for fluorine on the worn surface and the temperature-dependent adsorption-desorption processes. •[N1888][NTf2] as additive in polar oil competes with base oil for surface interaction.•[N1888][NTf2] as additive in a polar oil hardly change friction.•[N1888][NTf2] showed wear reduction properties as additive in a polar oil.•Tribology results are related with the IL-surface chemical interaction.
ISSN:0301-679X
1879-2464
DOI:10.1016/j.triboint.2017.08.004