Abstract
The conductivity of anodic and corrosion films on zirconium was found to increase during heating in vacuum. The conductivity changes at 450°C were studied on anodic films which were 0.6, 0.75, 0.9, and 1.5 μ in thickness. The change in conductivity was attributed to the diffusion of anion vacancies into the oxide with an estimated diffusion coefficient of . Corrosion films produced in water at 350°C appeared to have higher diffusion coefficients. Among the materials zirconium, Zircaloy‐1, and Zircaloy‐2, specimens of zirconium had the highest corrosion rates and diffusivities (as judged by the conductivity changes). Consequently, an effect of vacuum heating on corrosion was expected and subsequently confirmed. Enhanced oxide growth was observed after corroded specimens were heated at 600°C for 1 min. The increase in weight gain was greater than would be expected from a simple restoration of dissolved oxide.
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