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<p>This study investigated the surface and electrochemical properties of TixNbySn alloys (<i>x</i> = 35; 45% and <i>y</i> = 0; 2.5; 5.0; 7.5%) subjected to double-acid etching by solution of hydrochloric acid and nitric acid (HCl/HNO<sub>3</sub>) at different temperatures (40, 60, and 80&#xa0;°C). The Ti-6Al-4V (ASTM F136) alloy, commonly used for implant’s manufacture, was also studied as reference. Alloy characterization was performed using optical microscopy, scanning electron microscopy (SEM), roughness analysis, wettability measurements, and surface energy determination. Corrosion behavior of the alloys was evaluated by electrochemical impedance spectroscopy and potentiodynamic polarization. Results demonstrated that Ti-35Nb-2.5Sn, followed by Ti-35Nb-5.0Sn, performed well after etching at 80&#xa0;°C for 20&#xa0;min, as evidenced by lower contact angles, higher surface energy, and enhanced corrosion performance. These findings suggest that Ti-35Nb alloys with up to 5% Sn are promising for biomedical use. This study provides novel insights into the optimization of Ti-Nb-Sn alloys, evaluating the influence of double-acid etching, Nb and Sn contents, mechanical and heat treatments, and etching temperature on surface properties and corrosion behavior of the alloys.</p>

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Effect of Double-Acid Etching (HNO3/HCl) Temperature on the Surface and Electrochemical Properties of TixNbySn Alloys (x = 35; 45% and y = 0; 2.5; 5.0; 7.5%) for Biomedical Applications

  • 期刊论文

  • 发表日期：

    2025年9月3日

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  • Mayesk Alves Rocha,
  • Myllena Vieira Silva,
  • Emanoel Carlos Simas Barboza,
  • Alana Santos Oliveira,
  • Eduarda Vieira Lima,
  • Sandro Griza,
  • Carlos Otavio Damas Martins

摘要

This study investigated the surface and electrochemical properties of TixNbySn alloys (x = 35; 45% and y = 0; 2.5; 5.0; 7.5%) subjected to double-acid etching by solution of hydrochloric acid and nitric acid (HCl/HNO3) at different temperatures (40, 60, and 80 °C). The Ti-6Al-4V (ASTM F136) alloy, commonly used for implant’s manufacture, was also studied as reference. Alloy characterization was performed using optical microscopy, scanning electron microscopy (SEM), roughness analysis, wettability measurements, and surface energy determination. Corrosion behavior of the alloys was evaluated by electrochemical impedance spectroscopy and potentiodynamic polarization. Results demonstrated that Ti-35Nb-2.5Sn, followed by Ti-35Nb-5.0Sn, performed well after etching at 80 °C for 20 min, as evidenced by lower contact angles, higher surface energy, and enhanced corrosion performance. These findings suggest that Ti-35Nb alloys with up to 5% Sn are promising for biomedical use. This study provides novel insights into the optimization of Ti-Nb-Sn alloys, evaluating the influence of double-acid etching, Nb and Sn contents, mechanical and heat treatments, and etching temperature on surface properties and corrosion behavior of the alloys.