Electrochemical K. Doi 1 and S. Hiromoto 1 1 Research Center for Structural Materials, National Institute for Materials Science (NIMS) Hydrogen embrittlement of metallic materials has been reported mainly only for high-strength steels, and most hydrogen embrittlement studies have targeted steel materials; however, with the recent expansion of the use of Mg alloys, hydrogen embrittlement studies of these materials are accelerating. However, unlike steel materials, electrochemical hydrogen permeation testing of Mg alloys is difficult. One reason is that these materials are more corrosive than steel materials. In this study, we attempted electrochemical hydrogen permeation tests of Mg-based materials, which are particularly susceptible to corrosion, by devising test solutions for the hydrogen detection and introduction sides in the electrochemical hydrogen permeation test. Thin sheets of pure Mg, AZ31 alloy, and 68PP33--2211 Measurement of Hydrogen Diffusion Coefficient for Poster Presentation ｜NIMS Award Symposium 2023WE43 alloy with 25 mm x 25 mm x 0.3 mm were used as specimens. A Devanathan-Stachurski cell was used for electrochemical hydrogen permeation tests. After the sample was set in the cell, the hydrogen detection side was filled with 2-propanol and the specimen was polarized at +200 mV (vs. SHE). The hydrogen introduction side was filled with saturated Mg(OH)2 solution, and hydrogen was introduced into the specimen by applying a current. The hydrogen diffusing through the specimen was measured as hydrogen permeation current at the hydrogen detection side. On the hydrogen detection side, the residual current was less than 0.1 µA/cm2 immediately after the onset of polarization. For pure Mg, AZ31 alloy, and WE43 alloy, it took more than 10,000 s for the hydrogen permeation current to start increasing, suggesting that the hydrogen diffusion coefficient is much smaller for Mg-based materials than for steel materials. P3 ｜ EvaluationMg-based Materials
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