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Previous work has demonstrated that the wear losses of stainless steel 304 and Al alloy 6061 under sliding in lubricant (oil and grease) mixed with dilute H2SO4 solution can be greatly reduced when a small amount of oxygen-active element (yttrium or cerium) powder is added to the lubricant. In order to explore the mechanism responsible for the beneficial effect of yttrium on corrosive wear resistance, corrosive-wear tests were carried out at different sliding speeds in lubricants with and without yttrium added respectively. Effects of yttrium on friction behavior of the materials were also studied. Worn surfaces were examined using SEM for better understanding of the role that yttrium played in corrosive wear. Possible mechanisms responsible for the beneficial effect of the oxygen-active element on corrosive wear are discussed.
wear, friction, corrosion, oxygen-active element, oxide-film bonding
Postdoctoral fellow, University of Alberta, Edmonton, Alberta
Assistant professor, University of Alberta, Edmonton, Alberta