Abstract

The corrosion electrochemical behavior of molybdenum depending on the melt composition (imitators of spent nuclear fuel (SNF) components) in an oxidizing atmosphere is studied. Thermodynamic analysis of possible corrosion processes is performed using the HSC Chemistry 9.0 software in the Equilibrium calculations module. The rate of metal corrosion is estimated using gravimetry. The real products of the corrosion process and those expected from the thermodynamic calculations are compared using electron probe microanalysis (EPMA) and X-ray diffraction (XRD) analysis. The molybdenum concentration in frozen melt samples is studied by an atomic absorption method. The rate of molybdenum corrosion depends on the testing time. The decrease in the corrosion rate in time can be explained by the accumulation of Nd³⁺ and Ce³⁺ ions in the near-electrode layer, and corrosion occurs in the diffusion mode. The corrosive activity of the salt melt increases with the temperature and the ionic strength of the melt.

中文翻译：

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含铈和三氯化钕添加剂的LiCl-KCl熔体中钼的腐蚀电化学行为

摘要

研究了钼在氧化气氛中的腐蚀电化学行为，该行为取决于熔体成分（乏核燃料（SNF）组分的模拟物）。可使用平衡计算模块中的HSC Chemistry 9.0软件对可能的腐蚀过程进行热力学分析。使用重量分析法估算金属腐蚀的速率。使用电子探针微分析（EPMA）和X射线衍射（XRD）分析比较腐蚀过程的实际产物和热力学计算所期望的产物。通过原子吸收法研究了冷冻熔体样品中的钼浓度。钼的腐蚀速率取决于测试时间。Nd ³⁺的积累可以解释腐蚀速率随时间的降低。Ce ³⁺离子在近电极层中扩散，腐蚀在扩散模式下发生。盐熔体的腐蚀活性随温度和熔体的离子强度而增加。