Abstract
Two series of halogen-free ionic liquid (IL) lubricants, 1-alkyl-3-methylimidazolium saccharinates and acesulfamates, were prepared from nonnutritive sweeteners saccharin sodium and acesulfame potassium. The kinematic viscosity, viscosity index, thermal and hydrolysis stabilities, corrosion and tribological properties of the ILs were systematically evaluated. As compared with conventional halogen-containing ILs, these ILs are resistant to hydrolysis and cause no corrosion to the rubbed metallic surface because of their halogen-free characteristic. They were proved to be good lubricants not only for steel/steel friction pairs but also for steel/copper friction pairs. They can be used as ‘green’ alternatives to conventional halogen-containing IL lubricants as they are environmentally friendly with good biodegradability and reduced toxicity.
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