Corrosion of uranium in liquid water under contained conditions with a headspace deuterium overpressure. Part 2: The ternary U + H2O(l) + D2 system
Corrosion of uranium in liquid water under contained conditions with a headspace deuterium overpressure. Part 2: The ternary U + H2O(l) + D2 system
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DOI：
10.1016/j.corsci.2019.02.016
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发表时间：
2019-05
影响因子：
8.3
通讯作者：
A. Banos;K. Hallam;T. Scott
中科院分区：
文献类型：
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作者：
A. Banos;K. Hallam;T. Scott
通过在不同温度下进行九个单独的反应，研究了氘超压下未辐照的铀与液态水的反应。使用 FIB、SIMS 和 XRD 对表面进行腐蚀后检查。实验停止后测量反应水的pH值和样品脱气。同位素标记可以更好地研究该系统中发生的机制。分析表明，块体-UH3 在金属-氧化物界面处形成。观察到的顶部空间气体逸出减少归因于氧化产生的氢气的气体抑制，而不是 D2 气体通过水的迁移。这种抑制有利于 UH3 的形成。
The reaction of unirradiated-U with liquid water under deuterium overpressure was studied by conducting nine separate reactions at different temperatures. Post-corrosion examination of the surfaces was conducted using FIB, SIMS and XRD. Measurements of the reacting-water pH and sample degassing were made after the experiments were stopped. Isotopic labelling allowed better investigation of the mechanisms occurring in this system. The analyses showed that bulk-UH3 forms at the metal-oxide interface. The observed gas evolution reduction in the headspace was attributed to gas suppression of hydrogen generated through oxidation, andnotD2 gas migration through the water. This suppression facilitates UH3 formation.