Investigations on the potential use of
ionic liquids (ILs) as additives in lubricants have
increased in the recent past. Low miscibility of ILs in
the non-polar oils is a major obstacle in maintaining an
optimum lubrication performance. This article focuses
on the use of Trihexyltetradecyl phosphonium bis (2,4,4-
trimethylpentyl) phosphinate as an additive in mineral
base oil. Wear rate was estimated for different
concentrations of IL at constant load and temperature.
Coefficient of friction was found to be least in 3% when
compared to 5% and 1% by volume concentration. This
was further validated by the SEM and AFM analysis
carried out. ZDDP was blended with the IL and the
additive interaction was also studied.