金属中で水素誘起変質相あるいは水素化物相の生成を伴いながらの水素透過過程の一考察

概要

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The hydrogen permeation rate through metals, accompanying with the phase transition of the matrix to the hydrogen-induced foreign phases or hydride phases during permeation was discussed. The results on hydrogen permeation in mild steel and α-Pd specimens obtained by an electrochemical method were explained by a model in which the rate-determining step of the permeation is a hydrogen-diffusion process in the remaining matrix phases. The apparent hydrogen diffusivity determined from the theoretical permeation transient derived under the condition of the homogeneous medium throughout the specimen is equivalent to the diffusivity in the remaining matrix phase. However, the apparent hydrogen concentration directly beneath the surface determined by the theoretical solution of a homogeneous medium corresponds to the phase equilibrium hydrogen concentration of the matrix phase in the phase boundary related to the moving rate parameter of the phase boundary. The hydrogen concentration profiles during permeation through mild steel and α-Pd were calculated under the various diffusion parameters.
長崎大学工学部,Faculty of Engineering, Nagasaki Universityの論文