The release and diffusion of atomic H was studied by using cathodically polarized electrodes of the metal. The permeation fluxes were measured by using mass spectroscopic methods. It was then possible to determine the atomic H diffusion coefficients, and to obtain the relative values of the polarized metal surface coverage and the polarization curve of the metal in HCl. It was deduced that the diffusivity of H in Fe was equal to 6.67 x 10-5cm2/s.

B.Lavessiere, J.L.Philippart, J.Pagetti: Electrochimica Acta, 1991, 36[3-4], 615-20