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The electrochemical permeation method is often used to study hydrogen diffusion and trapping in steels ; unfortunately, there is great scatter in the experimental results. To identify the reason for this scattering, experiments were carried out using pure iron and pure palladium specimens. It is clearly shown that on the iron samples, surface phenomena are not controlled. In particular, the passive layer on the exit side induces variation of the hydrogen concentration on this side with time. Ondoi:10.1051/jp4:1995750 fatcat:uzizr332zbcvpdl433ueid3lfy