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<p>Surface functionalisation using nanostructured coatings represents a promising strategy for enhancing the corrosion and wear resistance of commonly used biomedical metallic implants, such as 316&#xa0;L stainless steel. In this study, we investigated the effects of niobium pentoxide (Nb<sub>2</sub>O<sub>5</sub>) and amorphous carbon (a-C) coatings, which were applied to the surfaces of 316&#xa0;L stainless steel via the reactive sputtering technique. A series of pin-on-disk analyses and electrochemical tests were performed under various environmental conditions. The results clearly indicated that both coatings significantly reduced the coefficient of friction compared to the uncoated alloy when tested in air, 0.6&#xa0;mol L⁻¹ NaCl solution, and artificial saliva. Under all tested conditions, the sample coated with a thin film of Nb<sub>2</sub>O<sub>5</sub> demonstrated the lowest values for wear volume and wear rate. Electrochemical assays provided compelling evidence of the effectiveness of reactive sputtering in creating coatings that markedly enhance the resistance of 316&#xa0;L stainless steel to uniform and localised corrosion processes when exposed to 0.6&#xa0;mol L⁻¹ NaCl and artificial saliva solutions.</p> Graphical abstract <p></p>

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Highlighting the significant potential of Nb2O5 and a-C coatings to improve the wear and corrosion resistance of 316L stainless steel

  • 期刊论文

  • 发表日期：

    2025年2月13日

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  • M. O. A. Ferreira,
  • K. R. Santos,
  • F. E. Mariani,
  • R. V. Gelamo,
  • N. B. Leite Slade,
  • M. M. Morais,
  • C. A. Fortulan,
  • H. C. Pinto,
  • J. A. Moreto

摘要

Surface functionalisation using nanostructured coatings represents a promising strategy for enhancing the corrosion and wear resistance of commonly used biomedical metallic implants, such as 316 L stainless steel. In this study, we investigated the effects of niobium pentoxide (Nb2O5) and amorphous carbon (a-C) coatings, which were applied to the surfaces of 316 L stainless steel via the reactive sputtering technique. A series of pin-on-disk analyses and electrochemical tests were performed under various environmental conditions. The results clearly indicated that both coatings significantly reduced the coefficient of friction compared to the uncoated alloy when tested in air, 0.6 mol L⁻¹ NaCl solution, and artificial saliva. Under all tested conditions, the sample coated with a thin film of Nb2O5 demonstrated the lowest values for wear volume and wear rate. Electrochemical assays provided compelling evidence of the effectiveness of reactive sputtering in creating coatings that markedly enhance the resistance of 316 L stainless steel to uniform and localised corrosion processes when exposed to 0.6 mol L⁻¹ NaCl and artificial saliva solutions.

Graphical abstract