The corrosion behavior of Zircaloy-4 (Zry-4) at 360 °C 0.01 M LiOH aqueous solution was in-situ monitored by electrochemical impedance spectroscopy (EIS). The EIS spectra of the as-received Zry-4 (Zry-4A) shows two-time constants feature during corrosion. The oxide layer impedance and capacitive show cyclic behavior while those of β-quenched Zry-4 sample (Zry-4Q) increased with exposure time increases. It may relate to the evolution of the defects and dielectric property of the oxide film and relaxation which evolves after the stress relief. The effect of heat treatment on the corrosion mechanism of the Zircaloy-4 was discussed.

中文翻译：

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Zircaloy-4在高温锂化水中早期腐蚀行为的原位电化学阻抗谱研究

通过电化学阻抗谱（EIS）原位监测Zircaloy-4（Zry-4）在360°C 0.01 M LiOH水溶液中的腐蚀行为。收到的Zry-4（Zry-4A）的EIS光谱显示出腐蚀期间的两次常数特征。氧化层的阻抗和电容表现出循环行为，而β淬灭的Zry-4样品（Zry-4Q）的氧化物和阻抗随暴露时间的增加而增加。这可能与氧化膜缺陷和介电性能的演变以及应力释放后的松弛有关。讨论了热处理对Zircaloy-4腐蚀机理的影响。