Influence of concentration and anion alkyl chain length on tribological properties of imidazolium sulfate ionic liquids as additives to glycerol in steel–steel contact lubrication

Commercially available ionic liquids were used as additives in the model lubricant fluid glycerol. The stability of the mixtures was controlled by measuring of turbidity. Tribological experiments have been performed on a reciprocating sliding tribometer in the boundary lubrication regime with three...

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Bibliographic Details
Published in:Tribology international 2016-05, Vol.97, p.234-243
Main Authors: Pejaković, V., Tomastik, C., Dörr, N., Kalin, M.
Format: Article
Language:English
Subjects:
Additives
AFM
Anions
Chains
Friction
Glycerols
Ionic liquids
Tribology
Turbidity
Wear
XPS
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Summary:Commercially available ionic liquids were used as additives in the model lubricant fluid glycerol. The stability of the mixtures was controlled by measuring of turbidity. Tribological experiments have been performed on a reciprocating sliding tribometer in the boundary lubrication regime with three ionic liquid concentrations, as well as with neat glycerol and the neat ionic liquids at 100°C. Wear and friction were measured, and the worn surfaces were examined with optical microscopy, atomic force microscopy and X-ray photoelectron spectroscopy. The results show the influence of the ionic liquid concentration and the anion alkyl chain length on the tribological behavior. Significant improvement in friction and wear reduction at low ionic liquid concentrations was detected and attributed to sulfur species in tribofilm. •Tribocorrosion investigations imidazolium sulfate ionic liquid additives.•Influence of additive concentration on tribological behavior.•Influence of additive chemistry on tribological behavior.•Influence of anion on tribofilm chemistry.
ISSN:0301-679X
1879-2464
DOI:10.1016/j.triboint.2016.01.034