Abstract
Hydrogen absorption/desorption has been investigated in the three series of solid solution bcc alloys and It has been found that H absorption at pressures smaller than one bar can only occur after elimination of the oxide films by heating the alloys to temperatures higher than 600 K. Hydrogen desorption from pre-loaded materials (nH = H/Me ≥ 0.27) takes place on heating at much lower temperatures in the than in the alloys. The H diffusion parameters W and Do deduced from high temperature (>450 K) absorption experiments are: The higher value of the activation energy for H diffusion in Mo containing alloys is most likely due to H trapping by Mo atoms.
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