Abstract
The Co-Cr alloys which have an excellent strength and wear resistance are used as biomaterials such as artificial joints. In this study, corrosion resistance of Co-Cr alloy was investigated by using electrochemical measurements. Stainless steel type 316, Ti, Co and Cr were used as a comparing material. According to polarization curves, the Co-Cr alloy was maintained passive state in widely potential region as same as Cr. However, stainless steel type 316 occurred to localized corrosion in the passive region of Co-Cr alloy. The passive current density of Co-Cr alloy was constant without relation to NaCl concentration. The passive film on the Co-Cr alloy which had high localized corrosion resistance was stable against high chloride ion concentration. Open circuit potential evolution with immersion time of the Co-Cr alloy appeared to be similar to Cr behavior. As a result, reactivity of Co-Cr alloy was considered to dominate by Cr behavior. Therefore, the Co-Cr alloy is expected to use as the biomaterials with a sense of security.
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