Corrosion Resistance Evaluation of Carbon Ion Implanted Surface of Titanium Alloy: An in vitro Study

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  • KOSEKI Hironobu
    Department of Orthopedic Surgery, Nagasaki University Graduate School of Biomedical Sciences
  • 堀内 英彦
    Department of Orthopedic Surgery, Nagasaki University Graduate School of Biomedical Sciences
  • 志田 崇之
    Department of Orthopedic Surgery, Nagasaki University Graduate School of Biomedical Sciences
  • 依田 周
    Department of Orthopedic Surgery, Nagasaki University Graduate School of Biomedical Sciences
  • 野口 智恵子
    Department of Orthopedic Surgery, Nagasaki University Graduate School of Biomedical Sciences
  • 尾﨑 誠
    Department of Orthopedic Surgery, Nagasaki University Graduate School of Biomedical Sciences
  • 白石 孝信
    長崎大学大学院医歯薬学総合研究科生命医科学講座　生体材料学分野
  • 渡邊 郁哉
    長崎大学大学院医歯薬学総合研究科生命医科学講座　生体材料学分野
  • 馬場 恒明
    長崎県工業技術センター

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Other Title
  • 炭素イオン注入したチタン合金表面の耐腐食性評価
  • タンソ イオン チュウニュウ シタ チタン ゴウキン ヒョウメン ノ タイフショクセイ ヒョウカ

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Abstract

Physiological environments are severe corrosive conditions for the metallic biomaterials. The objective of this study was to characterize the corrosion behavior of carbon ion implantation (CII) which is a process originally developed for the fabrication of diamond-like carbon. The corrosion behaviors were examined using the potentiodynamic anodic polarization measurement in deaerated 0.9% sodium chloride solution at 37°C according to the Japanese Industrial Standards (JIS) T-0302. CII was applied to titanium alloy substrates by plasma source ion implantation. Polarization curves showed that the CII-treated surfaces kept lower current densities than the untreated titanium alloy under the biological condition (−0.5V∼+0.5V). The corrosion behaviors of CII-3hr and CII-4hr were similar, but CII-3hr showed pitting corrosion at around 2.7 V. CII surface engineering can be considered as beneficial for improving the corrosion resistance of titanium alloy in the physiological environment.

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