Abstract
The content at the reversible potential of hydrogen evolution reaction, diffusion coefficient and permeation rate of hydrogen in deformed mild steel were measured with a modified electrochemical technique. The dislocation density of such specimens was estimated from the integrated breadth of the profile of X-ray diffraction. From these experiments we obtained the following conclusion: (1) The content and diffusion coefficient of hydrogen in the undeformed specimen showed a good agreement with those given by Gonzalez' equation. (2) The plastic deformation was found to increase the content and to decrease the diffusion coefficient, and to change occlusion mode from endothermic to exothermic. (3) Such change in occlusion mode could be explained with an interaction between dislocation core and hydrogen. (4) The relationship obtained in the present study between dislocation density estimated from the amount of content and true strain was found to be in good agreement with previous results such as estimated from the profile of X-ray diffraction.
