Abstract
Surface segregation of sulphur and its effect on hydrogen permeation through vanadium have been studied by the use of in-situ sputter cleaning and in-situ AES analysis of specimen surfaces. Rates of hydrogen permeation in vanadium decrease to nearly one-tenth as the result of surface coverage by sulphur up to saturation. The surface segregation of sulphur hardly affects either the temperature or pressure dependency of hydrogen permeability. A new atomistic model has been developed to explain effects of surface segregated sulphur on dissociative hydrogen adsorption and on hydrogen permeation rates.
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