Abstract With the aim of evaluating the corrosion behavior of a Pu evaporator made from Zr in the Rokkasho Reprocessing Plant (RRP), the electrochemical characterization of Zr was investigated in Pu nitrate solutions. Before and after experiments, spectra of Pu nitrate solutions were recorded, and Pu4+ was oxidized to PuO2 2+ by heating these solutions. The ratio of PuO2 2+ in 3 mol dm−3 HNO3 was higher than that in 7 mol dm−3 HNO3 in our experiments. The maximum open circuit potential of Zr in the Pu nitrate solution was approximately 1 V in the Pu nitrate solution containing 7 mol dm−3 HNO3. However, there were no significant changes at high PuO2 2+ concentrations, and this value remained below the passivity breakdown potential under our experimental conditions. In this study, Zr showed high corrosion resistance, even though many PuO2 2+ ions existed in the Pu nitrate solution containing 7 mol dm−3 HNO3.

中文翻译：

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钚离子对硝酸钚溶液中锆电化学表征的影响

摘要 为了评估六所村后处理厂 (RRP) 中由 Zr 制成的 Pu 蒸发器的腐蚀行为，研究了 Zr 在 Pu 硝酸盐溶液中的电化学特性。实验前后，记录硝酸Pu溶液的光谱，通过加热这些溶液将Pu4+氧化为PuO2 2+。在我们的实验中，PuO2 2+ 在 3 mol dm-3 HNO3 中的比例高于在 7 mol dm-3 HNO3 中的比例。在含有 7 mol dm-3 HNO3 的硝酸 Pu 溶液中，Zr 在硝酸 Pu 溶液中的最大开路电位约为 1 V。然而，在高 PuO2 2+ 浓度下没有显着变化，并且在我们的实验条件下，该值仍然低于钝化击穿电位。在这项研究中，Zr 表现出高耐腐蚀性，