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김윤구,박광헌 慶熙大學校 材料科學技術硏究所 1997 材料科學技術硏究論集 Vol.10 No.-
Zircaloy cladding is one of important barriers against the release of radioactive fission products and a few kind of adsorbates can be on the surface. To see the effect of these adsorbates on the oxidation of Zircaloy, experiments on the oxidation of adsorbed Zircaloy tubes in air and steam were done, and the analysis was followed. At the temperature range between 400℃ and 450℃, LiOH adsorbates increase the Zircaloy oxidation rate. At the range 800℃-900℃, they retard the oxidation rate. LiOH adsorption affects only initial oxide layer formation. When weight gain is less than 20g/m^(2), LiOH adsorbates make the oxide film composed of small spheres. At 400℃-450℃, oxygen diffuses along the grain boundary rather than along the bulk. The increase of short-cut paths makes the oxidation rate increased. At 800℃-900℃, oxygen diffuses mainly by bulk diffusion, and surface structure change suppresses this bulk diffusion.
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