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<p>The corrosion behavior of Ti-0.45Ni-0.18Nb-0.18Ta alloy was systematically investigated in a simulated proton exchange membrane fuel cell (PEMFC) cathode environment by controlling F<sup>−</sup> concentration and pH, combining electrochemical measurements and surface characterization. The results show that this alloy can operate within a critical F<sup>−</sup> concentration range of 20–60&#xa0;ppm and a critical pH range of 1–2. The formation of Ta<sub>2</sub>O<sub>5</sub> and Nb<sub>2</sub>O<sub>5</sub> in the surface film increases its compactness, thereby significantly enhancing the corrosion resistance of the alloy. Ni and its oxides were not detected in the passive film on the alloy surface. These findings provide a basis for composition optimization and service boundary definition of Ta- and Nb-containing Ti-based materials in fluoride-containing acidic PEMFC cathode environments.</p>

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Corrosion behavior of Ti-0.45Ni-0.18Nb-0.18Ta alloy in simulated PEMFC cathode environments

  • 期刊论文

  • 发表日期：

    2026年6月23日

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  • Wenxiang Zhu,
  • Shu Zhu,
  • GuoHao Liu,
  • Bingxing Wang,
  • Bin Wang,
  • Yong Tian

摘要

The corrosion behavior of Ti-0.45Ni-0.18Nb-0.18Ta alloy was systematically investigated in a simulated proton exchange membrane fuel cell (PEMFC) cathode environment by controlling F− concentration and pH, combining electrochemical measurements and surface characterization. The results show that this alloy can operate within a critical F− concentration range of 20–60 ppm and a critical pH range of 1–2. The formation of Ta2O5 and Nb2O5 in the surface film increases its compactness, thereby significantly enhancing the corrosion resistance of the alloy. Ni and its oxides were not detected in the passive film on the alloy surface. These findings provide a basis for composition optimization and service boundary definition of Ta- and Nb-containing Ti-based materials in fluoride-containing acidic PEMFC cathode environments.