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<p>The potentiostatic anodic behavior of U–Zr alloys during electrorefining in molten chloride electrolytes was investigated and modeled. Experiments were conducted under two potentiostatic conditions, − 1.15&#xa0;V and − 0.85&#xa0;V. Neutron imaging was employed to characterize the internal structure at different coulombic charges under both potential conditions. We find that, during dissolution at − 1.15&#xa0;V, cracked regions within the zirconium-rich layer result in greater dissolution. Additionally, the volume of the undissolved alloy was similar for the same coulombic charge at both potentials. A level-set method was utilized to develop a potentiostatic dissolution model considering only uranium dissolution. This model considered factors such as the multiple diffusion layers formed by the porous zirconium layer and the limiting concentration of uranium ions. This model’s calculated current–time curve demonstrated good agreement with the experimental data. Notably, the model-calculated current density reached a steady state after a certain period, under which conditions the dissolution rate was primarily influenced by the surface area.</p>

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Investigating the potentiostatic anodic dissolution of U–Zr alloys in electrorefining

  • 期刊论文

  • 发表日期：

    2026年1月12日

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  • Sijing Liu,
  • Guoan Ye,
  • Yiqun Xiao

摘要

The potentiostatic anodic behavior of U–Zr alloys during electrorefining in molten chloride electrolytes was investigated and modeled. Experiments were conducted under two potentiostatic conditions, − 1.15 V and − 0.85 V. Neutron imaging was employed to characterize the internal structure at different coulombic charges under both potential conditions. We find that, during dissolution at − 1.15 V, cracked regions within the zirconium-rich layer result in greater dissolution. Additionally, the volume of the undissolved alloy was similar for the same coulombic charge at both potentials. A level-set method was utilized to develop a potentiostatic dissolution model considering only uranium dissolution. This model considered factors such as the multiple diffusion layers formed by the porous zirconium layer and the limiting concentration of uranium ions. This model’s calculated current–time curve demonstrated good agreement with the experimental data. Notably, the model-calculated current density reached a steady state after a certain period, under which conditions the dissolution rate was primarily influenced by the surface area.