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<p>The tribocorrosion behavior of implant materials plays a critical role in their long-term performance, especially in harsh physiological environments. This study investigates the tribocorrosion response of three commonly used metallic biomaterials: stainless steel 316L (SS 316L), commercially pure titanium (cpTi), and Ti-6Al-4V alloy, all annealed at 900&#xa0;°C for 2&#xa0;hours. These tests were performed in simulated body fluid (SBF) at 37&#xa0;°C to mimic human physiological conditions. Open-circuit potential (OCP) and potentiodynamic polarization (PDP) tribocorrosion tests were conducted to analyze the corrosion potential, current density, wear rate, and passivation behavior. Upon initiation of mechanical wear, the OCP dropped significantly, indicating passive film breakdown: from 172, 621, and 488&#xa0;mV to −&#xa0;347, −&#xa0;1020, and −&#xa0;930&#xa0;mV for SS 316L, cpTi, and Ti-6Al-4V, respectively. SS 316L showed the lowest wear volume (0.008914 mm<sup>3</sup>) under OCP conditions, which increased significantly to 0.192778 mm<sup>3</sup> under PDP, accompanied by pitting corrosion. In contrast, Ti-6Al-4V alloy displayed a decrease in wear volume from 0.33 mm<sup>3</sup> in OCP to 0.30 mm<sup>3</sup> in PDP under similar conditions. These findings highlight the superior tribocorrosion resistance and biocompatibility of titanium-based materials over SS 316L, affirming their greater suitability for biomedical implant applications in corrosive physiological environments.</p>

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Tribocorrosion Behavior of Heat-Treated SS 316L, cpTi, and Ti-6Al-4V for Biomedical Implants

  • 期刊论文

  • 发表日期：

    2025年11月20日

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  • Rupesh Kumar,
  • R. K. Gautam

摘要

The tribocorrosion behavior of implant materials plays a critical role in their long-term performance, especially in harsh physiological environments. This study investigates the tribocorrosion response of three commonly used metallic biomaterials: stainless steel 316L (SS 316L), commercially pure titanium (cpTi), and Ti-6Al-4V alloy, all annealed at 900 °C for 2 hours. These tests were performed in simulated body fluid (SBF) at 37 °C to mimic human physiological conditions. Open-circuit potential (OCP) and potentiodynamic polarization (PDP) tribocorrosion tests were conducted to analyze the corrosion potential, current density, wear rate, and passivation behavior. Upon initiation of mechanical wear, the OCP dropped significantly, indicating passive film breakdown: from 172, 621, and 488 mV to − 347, − 1020, and − 930 mV for SS 316L, cpTi, and Ti-6Al-4V, respectively. SS 316L showed the lowest wear volume (0.008914 mm3) under OCP conditions, which increased significantly to 0.192778 mm3 under PDP, accompanied by pitting corrosion. In contrast, Ti-6Al-4V alloy displayed a decrease in wear volume from 0.33 mm3 in OCP to 0.30 mm3 in PDP under similar conditions. These findings highlight the superior tribocorrosion resistance and biocompatibility of titanium-based materials over SS 316L, affirming their greater suitability for biomedical implant applications in corrosive physiological environments.