Evaluation of corrosion resistance of Co-Cr alloy in NaCl solution

Ryouji Suzuki, Kazuhiko Noda, Yusuke Tsutsumi, Takao Hanawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


Co-Cr alloys, which have an excellent strength and wear resistance, are used as biomaterials in applications such as artificial joints. In this study, the corrosion resistance of Co-Cr alloy was investigated by electrochemical measurements. Type 316 Stainless steel, Ti, Co, and Cr were used as comparison materials. According to the polarization curves obtained in this study, the Co-Cr alloy maintained a passive state over a wide potential region, same as that observed for Cr. However, localized corrosion of type 316 stainless steel occurred to in the passive region of Co-Cr alloy. The passive current density of Co-Cr alloy was constant independent of NaCl concentration. The passive film on Co-Cr alloy, which has high localized corrosion resistance, was stable against chloride ions of high concentration. Open circuit potential of the Co-Cr alloy changing with immersion time appeared to be similar to that of Cr. As a result, the reactivity of Co-Cr alloy was considered to be dominated by Cr. Therefore, the Co-Cr alloy is expected to be safely used as biomaterials.

Original languageEnglish
Title of host publicationECS Transactions
PublisherElectrochemical Society Inc.
Number of pages5
ISBN (Electronic)9781607685395
Publication statusPublished - 2013

Publication series

NameECS Transactions
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

ASJC Scopus subject areas

  • Engineering(all)


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