Abstract: The effects of several
lubricating oil additives on the friction and wear properties of
Cr2O3 coating were studied with a block-on-ring tester at
ambient condition. The results indicate that, relative to the
base oil, oleic acid is effective to reduce friction while the
others are not; A remarkable wear reduction is obtained by zinc
dialkyldithiophosphate (ZDDP), tricesyl phosphate (TCP) and
oleic acid but not by sulphurized olefin (SO). The
concentrations of these additives have great influence on the
wear behaviour of Cr2O3 coating, while a little influence on the
friction behaviour. Analytical results of XPS show that the
wear-reducing action of ZDDP and TCP are a result of the
formation of tribochemical reaction films on the rubbing
surfaces, a slight wear-increasing action of SO is due to no
tribochemical reaction between Cr2O3 coating and SO or its
decomposed products.
Key words:
Friction Wear Coating Additive
chemistry
Manuscript received on July
11, 1992
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