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<p>To visualize hydrogen entry and diffusion into metals under high humidity corrosion conditions, an irreversible hydrogenochromic sensor was fabricated using polyaniline and resin layers. The color of the sensor changed due to the reaction with atomic state hydrogen in metals, and the color change was irreversible. In addition, the sensor was stable at 90%RH and sensitive enough to visualize the corrosion-induced hydrogen entry under NaCl droplet. Furthermore, the preferential hydrogen diffusion at random grain boundaries of pure Ni was successfully visualized, showing that the spatial resolution of the sensor is micrometer scale. This study paves the way to investigate hydrogen entry behavior in correlation with the corrosion process in long-term corrosion tests.</p>

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An irreversible hydrogenochromic sensor applicable to corrosion environments with high sensitivity and high spatial resolution

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年7月1日

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  • Zhenting Wang,
  • Saya Ajito,
  • Yongxin Wang,
  • Motomichi Koyama,
  • Eiji Akiyama,
  • Hiroshi Kakinuma

摘要

To visualize hydrogen entry and diffusion into metals under high humidity corrosion conditions, an irreversible hydrogenochromic sensor was fabricated using polyaniline and resin layers. The color of the sensor changed due to the reaction with atomic state hydrogen in metals, and the color change was irreversible. In addition, the sensor was stable at 90%RH and sensitive enough to visualize the corrosion-induced hydrogen entry under NaCl droplet. Furthermore, the preferential hydrogen diffusion at random grain boundaries of pure Ni was successfully visualized, showing that the spatial resolution of the sensor is micrometer scale. This study paves the way to investigate hydrogen entry behavior in correlation with the corrosion process in long-term corrosion tests.