Abstract
Hydrogen desorption from the surface oxide layer of 6061 aluminum alloy was investigated by combined tension and outgassing experiments. Outgassing corresponded to the deformation process, which initially released surface-adsorbed hydrogen. After elastic deformation, the as-received specimen released hydrogen because of the rupturing of the surface oxide layer. The hydrogen-charged specimen showed lower hydrogen concentration and hydrogen release rate than the as-received specimen. The second hydrogen release peak was due to the hydrogen accumulation at the interface between the oxide layer and matrix. The irregular sharp hydrogen release peaks resulted from the hydrogen bubble exposed to the surface during the rupture of the surface oxide layer.
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