Abstract
Hydrogen in aluminum and its alloys has a great influence on the occurrence of blisters. It is known that hydrogen may be absorbed during heat treatment process. In this study, the effect of exposure to SO2-bearing atmosphere on the hydrogen absorption into Al–Mg alloys during annealing was investigated. The exposure treatment was confirmed to cause absorption of sulfur on the specimen surface, and was found to increase the hydrogen content during annealing in a wet atmosphere due to promotion of hydrogen absorption. In contrast, without the exposure treatment, the hydrogen content decreased during the annealing due to release of hydrogen. The amount of absorbed hydrogen increased with increasing annealing temperature, time and humidity in the atmosphere. The morphology of oxide film formed during annealing was affected by the sulfur adsorption on the surface and was presumed to influence the hydrogen absorption/release behavior in Al–Mg alloys. In pure aluminum, however, there was no significant influence of the exposure on the inner hydrogen content after annealing, while the number of blisters that occurred on the surface after annealing increased by the sulfur adsorption on the surface prior to annealing.
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