Hydrogen Trapping Inside Metals and Metal Oxides
The anomalous behavior of hydrogen in terms of its solubility and diffusivity in metals and oxides has been the subject of repeated investigations [1–6]. The diffusion coefficients of hydrogen in metals reported in the literature have usually been determined under the assumption that the hydrogen concentration is governed by Fick’s law. Figure 5.1 summarizes some of the experimental data on the diffusivity of hydrogen reported in the literature . It should be noted that small values of the diffusion coefficient were obtained for work-hardened samples (designated as curves 6). Figure 5.1 indicates that the diffusion coefficient is a function of other variables besides the temperature and that these neglected variables are in some way related to the work hardening experienced by the specimen. There are, therefore, some doubts about the validity of Fick’s law and the simple physical model of random motion through the electrode.
KeywordsHydrogen Diffusion Current Transient Trap Site Hydrogen Transport Hydrogen Trapping
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