Evaluation of friction decomposition and friction property of ionic liquids having non-fluorine-based inorganic acid

Abstract

Ionic liquids, which are salts with low melting point, are expected to be used as new lubricants because of their unusual properties. Non-fluorination of ionic liquids is one of the big issues to apply them as lubricants. In this research, we used non-fluorine-based inorganic acid (e.g. phosphoric acid, and sulfuric acid), investigated their friction properties. In addition, we discussed the reaction mechanism of ionic liquids on the friction surface by using a quadrupole-mass-spectrometer and X-ray photoelectron spectroscopy.