The corrosion study of Co-Cr-Ni alloy fabricated by powder metallurgy

Abstract

Cobalt-based alloys have been widely used in biomedical application. In this research, various compositions of Co-Cr-Ni alloys were developed and produced by powder metallurgy route. This study was also aimed to investigate the corrosion behavior of Co-Cr-Ni alloys. The Co-Cr-Ni powders were first milled using planetary mill and compacted using uniaxial hand press to a pellet shape before being sintered using tube furnace. Immersion test was carried out in a water bath while maintaining the temperature of 37°C. Energy dispersive X-ray spectroscopy (EDS) was used for elemental analysis of the immersed samples. The result showed that sample with Co91Cr4Ni5 composition has the lowest mpy result after 30 days immersed in 0.9% sodium chloride solution while sample with Co57Cr20Ni23 composition recorded the highest mpy value.