Abstract
The effects of several lubricating oil additives on the friction and wear properties of Cr 2O 3 coatings were studied using a block-on-ring tester under ambient conditions. The results show that, compared with the base oil, oleic acid, glycol oleate and dibutyl phosphite have a friction-reducing function but sulphurized olefin does not; a remarkable wear resistance is observed for dibutyl phosphite and oleic acid but not for glycol oleate and sulphurized olefin. The concentration of these additives has a great influence on the wear behaviour of the Cr 2O 3 coating but little influence on the friction behaviour. Analytical results of X-ray photoelectron spectroscopy show that the antiwear action of dibutyl phosphite is due to the formation of tribochemical reaction films on the rubbing surface and that the wear-increasing action of sulphurized olefin may be related to the physical adsorption of this additive and its decomposed products on the rubbing surfaces.
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