[Show abstract][Hide abstract] ABSTRACT: Tribological properties of three novel phosphates-based ionic liquids (ILs), i.e., 1,3-diethyl imidazolium diethylphosphate,
1-ethyl-3-butyl imidazolium diethylphosphate, and 1-ethyl-3-octyl imidazolium diethylphosphate, were evaluated as lubricants
for the steel–steel sliding pair by using an Optimol-SRV oscillating friction and wear tester. The chemical compositions of
the boundary films generated on steel contact surfaces were analyzed with the use of a scanning electron microscope (SEM)
with a Kevex energy dispersive X-ray analyzer attachment (EDS), and an X-ray photoelectron spectrometer (XPS). The results
showed that these phosphate functional group-containing ionic liquids exhibit excellent tribological performance especially
at a moderate temperature. The imidazole phosphate ionic liquid has no corrosion to steel. The mechanism for the friction-reduction
and anti-wear effect of ionic liquids has also been proposed and discussed from the tribochemistry point of view.
No preview · Article · May 2009 · Tribology Letters
[Show abstract][Hide abstract] ABSTRACT: Several imidazole phosphate ionic liquids with varying carbon chain length have been synthesized at room temperature. Corrosion
characteristics and tribological properties of these synthesized ionic liquids were studied using four-ball friction and wear
testing machine. Its lubrication mechanism was also investigated by means of electron microscopy and X-ray photoelectron spectroscopy.
The experimental results showed that no corrosion was generated when the imidazole phosphate ionic liquid was applied to steel-steel
pair. Meanwhile, the imidazole phosphate showed excellent anti-wear and lubricating performances, its frictional performance
was related to the polarity of ionic liquids. It is suggested that the ionic liquids react with friction surface to form a
protective film of iron phosphate and result in reduction in friction and wear.
No preview · Article · May 2009 · Science in China Series E Technological Sciences