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首页> 外文期刊>Applied Surface Science >The microstructure and oxidation behavior of the N-doped modified layers on uranium surface prepared by pulsed laser irradiating
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The microstructure and oxidation behavior of the N-doped modified layers on uranium surface prepared by pulsed laser irradiating

机译：脉冲激光辐照制备的铀表面N掺杂改性层的微观结构和氧化行为

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摘要

The N-doped modified layer on uranium surface was prepared by pulsed laser irradiating in nitrogen atmosphere. The results of microstructure characterised by XRD, AES and XPS show that it is a composite layer with a gradual transition structure from UO2-xNy and uranium oxy-nitride (UNxOy) to UN and eventually to uranium from surface to interior. Initial oxidation behavior after sputtering for different time illustrates that UNxOy with U 4f(7/2) BE at 379.6 eV is inert under oxygen exposure. Further, the thermal stability study shows that the modified layer exhibits excellent ability to prevent the O atoms from diffusing into the interior at 423 K. Moreover, the corrosion protective properties of the N-doped modified layers before and after thermal treatment were evaluated through potentiodynamic polarization tests. The results show that the N-doped modified layer improved the corrosion protective properties of metallic uranium. The self-corrosive potential and self-corrosive current of the N-doped modified layer are - 5.75 x 10(-2) V vs. SCE and 1.37 x 10(-7) A/cm(2), while the values of metallic uranium were -5.67 x 10(-1) V vs. SCE and 8.08 x 10(-7) A/cm(2). After thermal treatment, its values are -8.57 x 10(-2) V vs. SCE and 4.83 x 10(-8) A/cm(2), indicating that the corrosion resistance of the N-doped modified layer was further improved.
机译：通过在氮气氛中脉冲激光辐照来制备铀表面的N掺杂改性层。用XRD，AES和XPS表征的微观结构结果表明，它是一个复合层，具有从UO2-xNy和氧氮化铀（UNxOy）到UN以及最终从表面到内部的铀逐渐过渡的结构。溅射不同时间后的初始氧化行为表明，在氧气暴露下，U 4f（7/2）BE为379.6 eV的UNxOy是惰性的。此外，热稳定性研究表明，改性层表现出优异的防止O原子在423 K扩散到内部的能力。此外，通过电位动力学评估了掺杂N的改性层在热处理前后的耐腐蚀性能。极化测试。结果表明，N掺杂改性层改善了金属铀的腐蚀防护性能。 N掺杂改性层的自腐蚀电位和自腐蚀电流-SCE为-5.75 x 10（-2）V和1.37 x 10（-7）A / cm（2），而金属值为铀相对于SCE为-5.67 x 10（-1）V和8.08 x 10（-7）A / cm（2）。热处理后，其值为-8.57 x 10（-2）V vs. SCE和4.83 x 10（-8）A / cm（2），表明N掺杂改性层的耐腐蚀性进一步提高。

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