1Department of Iron and Steel Metallurgy, Faculty of Engineering, Kyushu University, Fukuoka. Present address: Department of Mechanical Engineering, Fukui Institute of Technology, Fukui
The boundary conditions in electrochemical hydrogen permeation through α -palladium have been discussed, and then the diffusion coefficients of hydrogen between 278 K and 333 K have been determined. In the permeation experiment, the changes in electrode potential and current density at the cathodic surface have been found to correspond to those in dissolved hydrogen concentration and hydrogen entry flux at the cathodic surface, respectively. The temperature dependence of the diffusion coefficients of hydrogen free from trapping effect and surface effect in annealed α -palladium specimens is given by DH (m2/s)=2.40×10-7 exp (-21.6(kJ/mol)/RT).
hydrogen, diffusion coefficient, temperature dependence, palladium, electrochemical permeation method, boundary condition
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