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<p>Through investigating the influence of electrochemically charged hydrogen on microstructural damage and corrosion performance of an as-cast Ti–6Al–4V (in wt.%) alloy, it demonstrated that after being performed hydrogen-charging for 4&#xa0;h at an applied current density value of 50&#xa0;mA/cm<sup>2</sup>, micro cracks were preferentially presented in α-Ti phase and at interfaces between α-Ti and β-Ti phases. Moreover, the quantity of cracks increased with extending the hydrogen-charging time. Failure analysis demonstrated that micro cracks were caused by the formation of needle-like δ-TiH<sub>2</sub> hydride. For 4&#xa0;h-charged sample, all of the exposed α-Ti phase can be changed into hydrides, resulting in the formation of a layer of hydride with the thickness value of 5&#xa0;μm. After hydrogen-charging for 8 and 16&#xa0;h, the thicknesses values of formed hydride layers were 8 and 18&#xa0;μm, respectively. Due to anodic dissolution of hydrides, the corrosion resistance of charged samples was degraded. The determined current density values of the uncharged, 4&#xa0;h-charged, 8&#xa0;h-charged and 16&#xa0;h-charged samples were 34.7, 42.3, 50.7 and 63.4 nA/cm<sup>2</sup>, respectively.</p>

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Influence of electrochemical hydrogen-charging on microstructural damage and corrosion performance of an as-cast Ti–6Al–4V (wt.%) alloy

  • 期刊论文

  • 发表日期：

    2026年1月26日

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  • Zi-Shuo Chen,
  • Bao-Jie Wang,
  • Shuo Wang,
  • Xiang-Bo Xu,
  • Dao-Kui Xu

摘要

Through investigating the influence of electrochemically charged hydrogen on microstructural damage and corrosion performance of an as-cast Ti–6Al–4V (in wt.%) alloy, it demonstrated that after being performed hydrogen-charging for 4 h at an applied current density value of 50 mA/cm2, micro cracks were preferentially presented in α-Ti phase and at interfaces between α-Ti and β-Ti phases. Moreover, the quantity of cracks increased with extending the hydrogen-charging time. Failure analysis demonstrated that micro cracks were caused by the formation of needle-like δ-TiH2 hydride. For 4 h-charged sample, all of the exposed α-Ti phase can be changed into hydrides, resulting in the formation of a layer of hydride with the thickness value of 5 μm. After hydrogen-charging for 8 and 16 h, the thicknesses values of formed hydride layers were 8 and 18 μm, respectively. Due to anodic dissolution of hydrides, the corrosion resistance of charged samples was degraded. The determined current density values of the uncharged, 4 h-charged, 8 h-charged and 16 h-charged samples were 34.7, 42.3, 50.7 and 63.4 nA/cm2, respectively.