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The corrosion properties of a cast Co-Cr-Mo alloy were evaluated using anodic and cathodic polarization techniques. These data were compared with those for a Co-Cr-Mo alloy which had been exposed to a porous coating thermal cycle, both with and without a subsequent hot isostatic pressing (HIP) procedure. The thermal exposure during sintering was found to result in the formation of grain boundary precipitates and porosity, accompanied by a reduction in elemental segregation. This resulted in a reduction in mechanical properties, as well as an increase in corrosion resistance. The use of a HIP cycle, subsequent to sintering, provided an increase in both mechanical properties and corrosion resistance. The improvement in corrosion resistance was attributed to a further reduction in elemental segregation, in comparison with the as-sintered condition.
sintering, corrosion, hot isostatic pressing, porosity, Co-Cr-Mo alloy, implant materials, porous implants
Manager, Richards Medical Co., Memphis, TN