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<p>This study presents a comparative investigation of Ni45Ti55 and SS316L alloys deposited via micro-plasma additive manufacturing (MPAM), with emphasis on corrosion resistance, electrochemical behavior, ion release, and cell viability. Electrochemical analyses, including potentiodynamic polarization and electrochemical impedance spectroscopy (EIS), demonstrated that Ni45Ti55 exhibits a lower corrosion current density and higher polarization resistance than SS316L, confirming its superior passivation and slower corrosion kinetics. The enhanced resistance of Ni45Ti55 is attributed to the formation of a stable and protective titanium oxide (TiO<sub>2</sub>) layer, whereas SS316L relies on a chromium-rich oxide film that offers moderate stability but is more vulnerable under aggressive physiological conditions. Cell viability assessments further revealed that Ni45Ti55 is more biocompatible, as its TiO<sub>2</sub> layer effectively suppresses metallic ion leaching. In contrast, SS316L released higher amounts of Fe, Cr, and Ni ions, which are associated with cytotoxic and pro-inflammatory responses. Notably, Ni45Ti55 showed significantly reduced ion release, underscoring its long-term durability and suitability for biomedical environments. To the best of our knowledge, this is the first report directly correlating ion leaching with cell viability for MPAM-processed NiTi and SS316L alloys, thereby providing new insights into their corrosion mechanisms and biomedical applicability.</p>

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Comparative Analysis of Corrosion and Biocompatibility of Ni45Ti55 and SS316L Steel Deposited by Micro-Plasma Additive Manufacturing Process

  • 期刊论文

  • 发表日期：

    2025年11月14日

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  • Priyanka S. Bankar,
  • Pothamsetty Kasi V. Rao,
  • Pradyumn Kumar Arya,
  • Mayur S. Sawant,
  • Pankaj Kumar,
  • Neelesh Kumar Jain

摘要

This study presents a comparative investigation of Ni45Ti55 and SS316L alloys deposited via micro-plasma additive manufacturing (MPAM), with emphasis on corrosion resistance, electrochemical behavior, ion release, and cell viability. Electrochemical analyses, including potentiodynamic polarization and electrochemical impedance spectroscopy (EIS), demonstrated that Ni45Ti55 exhibits a lower corrosion current density and higher polarization resistance than SS316L, confirming its superior passivation and slower corrosion kinetics. The enhanced resistance of Ni45Ti55 is attributed to the formation of a stable and protective titanium oxide (TiO2) layer, whereas SS316L relies on a chromium-rich oxide film that offers moderate stability but is more vulnerable under aggressive physiological conditions. Cell viability assessments further revealed that Ni45Ti55 is more biocompatible, as its TiO2 layer effectively suppresses metallic ion leaching. In contrast, SS316L released higher amounts of Fe, Cr, and Ni ions, which are associated with cytotoxic and pro-inflammatory responses. Notably, Ni45Ti55 showed significantly reduced ion release, underscoring its long-term durability and suitability for biomedical environments. To the best of our knowledge, this is the first report directly correlating ion leaching with cell viability for MPAM-processed NiTi and SS316L alloys, thereby providing new insights into their corrosion mechanisms and biomedical applicability.