Abstract:

Ionic liquids have excellent tribological properties, but they can't dissolve in mineral oils and other nonpolar base oil, which limits their practical application. Two kinds of ionic liquids were synthesized and dissolved in esters semi-synthetic base oil as anti-wear additives and the tribological properties were evaluated by SRV IV oscillating friction and wear tester. The surface maps and wear volume of lower discs were measured by micro-3D surface mapping microscope. The chemical composition on the surface of wear scars were analyzed by X-ray photoelectron spectroscopes. The results indicate that the application of imidazolium dithiophosphates acid makes the semi-synthetic base oil decrease the friction coefficient from 0.085 to 0.034 and the wear volume from 84.2 x 10-5 mm3 to 20.6 x 10-5 mm3. This work provides an effective method for the practical application of ionic liquids.

Key words: ionic liquid, semi-synthetic base esters base oil, anti-wear additive