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<p>Titanium alloys, particularly Ti-6242, are widely utilized in aerospace, marine, and industrial applications due to their excellent strength-to-weight ratio and inherent corrosion resistance. However, their performance in aggressive environments, such as NaCl, HCl, and KOH, is limited by localized corrosion. In this study, a WC+Gr composite coating was applied to Ti-6242 via the dip-coating method to enhance its corrosion resistance. Electrochemical tests, including potentiodynamic polarization and electrochemical impedance spectroscopy (EIS), demonstrated significant improvements. In KOH, the coated samples exhibited a charge transfer resistance of 2086.75 Ω cm<sup>2</sup> and a corrosion current density of 1.31E<sup>−6</sup> mA/cm<sup>2</sup>, leading to a 90 % reduction in corrosion rate compared to uncoated samples. SEM analysis confirmed minimal surface degradation, highlighting the coating’s protective role. These findings demonstrate the potential of WC+Gr composite coatings in extending the durability of titanium alloys in harsh environments.</p>

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Synergistic effects of advanced composite coating for titanium alloys: Corrosion performance in aggressive media

  • 期刊论文

  • 发表日期：

    2025年11月8日

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  • Arumugam Perumal,
  • Veillan Ramachandran,
  • Shanmugam Suresh Kumar,
  • Venkataraman Vignesh

摘要

Titanium alloys, particularly Ti-6242, are widely utilized in aerospace, marine, and industrial applications due to their excellent strength-to-weight ratio and inherent corrosion resistance. However, their performance in aggressive environments, such as NaCl, HCl, and KOH, is limited by localized corrosion. In this study, a WC+Gr composite coating was applied to Ti-6242 via the dip-coating method to enhance its corrosion resistance. Electrochemical tests, including potentiodynamic polarization and electrochemical impedance spectroscopy (EIS), demonstrated significant improvements. In KOH, the coated samples exhibited a charge transfer resistance of 2086.75 Ω cm2 and a corrosion current density of 1.31E−6 mA/cm2, leading to a 90 % reduction in corrosion rate compared to uncoated samples. SEM analysis confirmed minimal surface degradation, highlighting the coating’s protective role. These findings demonstrate the potential of WC+Gr composite coatings in extending the durability of titanium alloys in harsh environments.