The corrosion behavior of Zircaloy-4 and morphology ofoxide film formed during in-situ UV light irradiationcorrosion experiment were investigated in this study. Forin-situ UV irradiation, a circulation loop and an autoclavewith sapphire windows were specially designed for thisexperiment. Corrosion experiments were conducted at 260 °Cand 7 Mpa with deionized water condition, and thedissolved hydrogen and oxygen concentrations werecontrolled for 7 days oxidation test. Zirconium alloys areconstantly irradiated by UV through sapphire windowsengineered in the wall of autoclave.The zirconium oxide was measured from scanningelectron microscopy (SEM) results on the UV irradiatedand non-irradiated regions. The chemistry of the surfaceoxides was analyzed with energy dispersive spectroscopy(EDS). The oxide thickness and chemical depth profilesacross the oxide were investigated to study the effect ofUV on the corrosion mechanism of the oxide layer formedin pre-transition regime of zirconium alloy corrosion.
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