Evaluation of corrosion resistance of Co-33Cr-5Mo-0.3N alloy using electrochemical impedance technique

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  • MANAKA Tomoyo
    Department of Metallic Biomaterials, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
  • KODAMA Haruna
    Department of Metallic Biomaterials, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
  • TSUTSUMI Yusuke
    Corrosion Property Group, Research Center for Structural Materials, National Institute for Materials Science
  • HANAWA Takao
    Department of Metallic Biomaterials, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University Center for Advanced Medical Engineering Research & Development, Kobe University

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Other Title
  • Co-33Cr-5Mo-0.3N 合金の電気化学インピーダンス法による耐食性評価
  • Co-33Cr-5Mo-0.3N ゴウキン ノ デンキ カガク インピーダンスホウ ニ ヨル タイショクセイ ヒョウカ

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Abstract

<p>The corrosion resistance of a Co-Cr-Mo alloy containing higher levels of N and Cr than conventional Co-Cr-Mo alloys was evaluated with electrochemical impedance and anodic polarization techniques in a lactic-acid-containing NaCl solution, and the results were compared with those from conventional and commercial Co-Cr-Mo alloys. In addition, surfaces of the alloys after anodic polarization were observed using an optical microscope. The resistance to corrosion until 72 h of Co-33Cr-5Mo-0.3N alloy was the strongest among Co-Cr-Mo alloys employed in this study. The corrosion resistance of Co-31.3Cr-6Mo until about 10 h was the strongest, while that at 72 h was moderate. Therefore, Co-33Cr-5Mo-0.3N alloy shows sufficient corrosion resistance, especially after 40-50 h. Elements C, Si, and Mn decrease the corrosion resistance of Co-Cr-Mo alloys；high concentrations of Cr and N increase it. The significance of evaluation using electrochemical impedance was clearly revealed by this study.</p>

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