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Hydrogen permeation through a martensitic stainless steel, coated with amorphous (a)-SiC film has been studied in the temperature range 480-550 K for an inlet pressure of 2*10 5 Pa. It is found that: (i) a-SiC thin coating acts as an efficient barrier to the H 2 permeation flux; (ii) chemical reactions occur between migrating hydrogen and free C atoms in the a-SiC layers with the formation of hydrocarbon compounds; and (iii) N + implantation of the a-SiC improves the barrier performances in terms of both hydrogen permeation and reduction in release of hydrocarbons.
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Checchetto et al. (1994) studied this question.
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