Issue 77, 2017

Tribochemistry and thermo-oxidative stability of halogen-free ionic liquids

Abstract

Heat generation by friction during machine operation causes thermo-oxidative degradation and evaporation of lubricants which in turn generates volatiles. Therefore, having an excellent thermo-oxidative stability is one of the desired prerequisites for the applicability of lubricants in tribological systems. This study reports new insights regarding the thermo-oxidative stability of halogen-free room-temperature ionic liquids (RTILs) as well as fundamental changes in the tribofilm's composition that have a positive impact on their tribological performance at elevated temperatures. In this context, the formation of binary iron phosphates/phosphides based tribofilms from a phosphonium phosphate-based RTIL has been reported for the first time. This RTIL significantly enhances both thermo-oxidative stability and tribological performance of alkylborane–imidazole complexes. A beneficial effect between this RTIL and a conventional friction modifier led to enhanced anti-wear properties supported by the presence of iron phosphide/phosphate tribofilms on the disc surfaces, as detected by XPS.

Graphical abstract: Tribochemistry and thermo-oxidative stability of halogen-free ionic liquids

Supplementary files

Article information

Article type
Paper
Submitted
18 Aug 2017
Accepted
10 Oct 2017
First published
16 Oct 2017
This article is Open Access
Creative Commons BY license

RSC Adv., 2017,7, 48766-48776

Tribochemistry and thermo-oxidative stability of halogen-free ionic liquids

V. Totolin, L. Pisarova, N. Dörr and I. Minami, RSC Adv., 2017, 7, 48766 DOI: 10.1039/C7RA09163J

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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