Abstract

Abstract Non-irradiated, stress-relieved Zircaloy-4 claddings were oxidized at 350, 400, 450 and 500 °C in air. Some samples were dipped in sea water, dried and heated. Weight gain measured as a function of time revealed that the oxidation has pre- and post-transition regions just like the reaction in high temperature steam and water, and that sea water salts enhanced the weight gain after the transition point. Optical microscopy was carried out on the post-test oxide layer and substrate metal structure. Rate constants of the oxidation were determined and proved to be close to those of the previous studies including the experiments in high temperature steam and water.

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