The present model could be used to analyze the data which were obtained by H permeation through metal membranes. The model took account of the ideal behavior which was predicted by the Nernst Equation and by Sievert’s Law. It yielded a single parameter, K, which quantified the deviation from Sievert/Nernst behavior. It was sufficiently general to allow for arbitrary chemical potentials of H on both sides of a sheet, in addition to an arbitrary initial H distribution within the sheet. Simulated permeation curves were presented which demonstrated the effect of the model parameters upon the permeation behavior. The model was applied to solution agitation during the permeation of a low-C steel sheet. By fitting the model curves to experimental data, the diffusivity, surface solubilities, and K values on both sides of a metal sheet could be obtained for given electrochemical charging conditions. When compared with other popular models, the present model fitted the experimental data well. The parameters which were obtained by using the model could be used to characterize a given charging process.

S.L.Amey, G.M.Michal, J.H.Payer: Metallurgical and Materials Transactions A, 1994, 25[4], 723-32