A novel imidazolium salt with antioxidation and anticorrosion dual functionalities as the additive in poly(ethylene glycol) for steel/steel contacts

► Imidazolium salts bearing sterically hindered phenol and benzotriazole were synthesized. ► The imidazolium salts have combined antiwear, antioxidation and anticorrosion function. ► Synergistic effect of ionic liquid component, phenol and benzotriazole was found.