A series of seven room-temperature ionic liquids (IL) have been studied as neat and 1 wt% base oil additives in the lubrication of steel and aluminum contacts under increasing sliding speed, normal load and temperature. IL used as neat lubricants can produce, depending on the composition, tribochemical processes at the aluminum-steel interface associated with an increase in friction coefficients and wear rates. When IL are used as 1 wt% additives, surfaces interactions can give friction and wear values lower than those obtained for the neat IL. The lubricating performance of the additives is more dependent on contact conditions than on composition.

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