An irreversible hydrogenochromic sensor applicable to corrosion environments with high sensitivity and high spatial resolution
Source abstract
Abstract
Abstract 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.
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Research context
OpenAlex topics: Gas Sensing Nanomaterials and Sensors · Corrosion Behavior and Inhibition · Hydrogen embrittlement and corrosion behaviors in metals
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References (48)
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