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International Hydrogen Conference (IHC 2012): Hydrogen-Materials Interactions

Editor
B. P. Somerday
B. P. Somerday
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P. Sofronis
P. Sofronis
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ISBN:
9780791860298
No. of Pages:
844
Publisher:
ASME Press
Publication date:
2014

Low pressure hydrogen corrosion of spherical U powders at room-temperature has yielded very consistent hydriding initiation times using ultra-pure H2 at 130 Pa following thermal activation in ultra-high vacuum (UHV). This consistency results from the powders being free of mechanical work, large inclusions, and geometrical anomalies. X-ray Photoelectron Spectroscopy (XPS) measurements on oxidized uranium are reported to relate thermally-induced chemical changes in the oxide to the initiation time. The uranium oxide film appears to be impervious to hydrogen except at defects (“cracks”) that are guarded by an oxygen chemical potential that retards the dissolution of hydrogen in the uranium...

Introduction
Experimental
Discussion
Acknowledgements
References
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