Abstract
The easy penetration of atomic hydrogen into SS and Fe and its slow recombinative release as H 2 lead to the establishment of a large hydrogen concentration below the surface when it is exposed to atomic hydrogen fluxes. Superinventory and superpermeation effects are a consequence therefrom. It is shown that these effects are due to the nature of atomic hydrogen particles and not mainly to the energy with which they strike the surface. A large sticking factor and penetration probability for low energy atomic hydrogen are suggested from the data. The influence of thin Ti and Pd coatings on the hydrogen concentration in Fe and SS under exposure to atomic hydrogen has been investigated. These coatings decrease the superpermeation and superinventory, presumably by enhancing the surface recombination to the gas phase. All experimental data can be explained within the framework of a model published previously.
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