The ionic liquids 1-butyl-1-methylpyrrolidinium bis(tri-fluoromethylsulfonyl)imide, [C4C1Pyrr][Tf2N], and 1-butyl-2,3-dimethylimidazolium bis(trifluoromethylsulfonyl)imide, [C4C1C1Im][Tf2N], were evaluated as neat lubricants for steel–steel sliding contacts using a ball-on-plate reciprocating tribometer under loads of 8, 18, and 30 N at room temperature conditions. A formulated semisynthetic oil was used for comparison. The best tribological behavior (friction coefficient and wear volume) was obtained with [C4C1C1Im][Tf2N] regardless of the load applied. Scanning electronic microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) analysis showed the presence of tribolayers containing fluorides on the lubricated metal surface produced by weak tribochemical reactions.
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Sánchez et al. (2014) studied this question.
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