Mechanism of local hydrogen entry into Fe sheets induced by atmospheric corrosion: Significance of potential, pH, and rust layer thickness

Hiroshi Kakinuma; Sachiko Hiromoto; Tomohiko Hojo; Saya Ajito; Motomichi Koyama; Eiji Akiyama

doi:10.1016/j.corsci.2024.112043

ジャーナル論文 Mechanism of local hydrogen entry into Fe sheets induced by atmospheric corrosion: Significance of potential, pH, and rust layer thickness

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Hiroshi Kakinuma, Sachiko Hiromoto, Tomohiko Hojo, Saya Ajito, Motomichi Koyama, Eiji Akiyama. Mechanism of local hydrogen entry into Fe sheets induced by atmospheric corrosion: Significance of potential, pH, and rust layer thickness. Corrosion Science. 2024, 232 (), 112043. https://doi.org/10.1016/j.corsci.2024.112043

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Local hydrogen entry under a NaCl droplet on an Fe sheet was analyzed employing a hydrogenochromic sensor and electrochemical hydrogen permeation tests. Large crystallographic pits formed in the initial stage barely promoted hydrogen entry, because the pits initiated in weak-acid and the initiation potential is higher than the potential of hydrogen evolution reaction. Hydrogen entry was accelerated by the acidification under an island-like rust layer. The rust layer became thick in the outer regions due to the alkalization around the rust-formed area. The hydrogen entry was prominent under the thick rust layer in drying process since it contains NaCl solution.

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