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Influence of the surface conditions on permeation in the deuterium-MANET system

TitleInfluence of the surface conditions on permeation in the deuterium-MANET system
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication1997
AuthorsSerra, Emanuele, and Perujo A.
JournalJournal of Nuclear Materials
KeywordsAdsorption, deuterium, Diffusion in solids, Gas phase permeation technique, Martensite, Martensitic steel DIN 1.4914 (MANET), oxidation, Pressure effects, Steel, Steel heat treatment, Surface phenomena, Surface treatment, Thermal effects, Transport properties, X ray photoelectron spectroscopy

The condition of the surfaces is of crucial importance for the deuterium permeation through materials. In this work a study of the surface constants for the adsorption (σk1) and release (σk2) of deuterium under different surface conditions on the martensitic steel DIN 1.4914 (MANET) has been carried out. The growth of an oxide surface layer (Cr2O3) of about 25-30 nm in a MANET sample, heat treated in an oxidizing environment, compared to the bare MANET that have a 'natural' oxide of about 5 nm has provoked a reduction of both the permeation rate and the recombination coefficient (about 3 orders of magnitude). In addition, the permeation governing process has changed from diffusion-limited to surface-limited. The measurements of the permeation rate of deuterium were performed by a gas-phase permeation technique over the temperature range 574-746 K and for deuterium driving pressures in the range from 3 to 105 Pa.


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Citation KeySerra1997215