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Corrosion tests on 2–9% Cr steels were conducted using steam and supercritical water under 0.1–25 MPa at 600 °C. The oxidation kinetics were similar in three different environments, and they showed near-parabolic behaviour. It appeared that the level of benefit arising from increased chromium content was not constant but was dependent on the exposure environment. Whilst it was evident that the increasing...
A novel route for fast zirconium oxidation is reported, using supercritical water, for the case of Zircaloy-4 tubes that are used to clad nuclear fuel pellets in pressurized water reactors. An adherent and dense monoclinic zirconia layer 28 µm thick is obtained after 5 h of supercritical water oxidation at 500 °C. The zirconia crystallites are about 13 ± 2 nm in size. This technique reduces the time...
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