Abstract
Tribological behavior of three Fatty Acid anion-based Ionic Liquids (FAILs) with the same ammonium cation ([N8881]) and different anions ([C16:0], [C12:0] and [C8:0]) were studied. Four different tribopairs (steel-steel, aluminum-steel, bronze-steel and tungsten carbide-steel) were tested for each FAIL using a ball-on-disc reciprocating test for 30 min (room temperature, 50 N-load, 4 mm of stroke length, and 15 Hz-frequency). Aluminum and tungsten carbide surfaces did not show evidence of oxidation changes, contact pressure and hardness being, respectively, the main parameters controlling tribological behavior. Bronze and steel samples showed surface oxidation changes during tests, which influenced friction and/or wear results. An increase in alkyl chain length of the anion led to an increase in tin oxidation of bronze and the formation of a low friction film of Fe3O4 on steel.
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