超声波辅助超临界CO_2处理铀表面技术

Ultrasound-Assisted Treatment of Uranium Surface With Supercritical Carbon Dioxide

开展了超声波对超临界CO2清洗铀样品表面污物效率影响的研究,探讨了利用超声波改善铀样品抗大气腐蚀效果的可行性。研究结果表明,向超临界CO2介质中引入超声波后,超临界CO2对样品表面的机油、水和三乙醇胺的清洗能力和效率都得到了显著提高。用俄歇电子能谱和XRD对样品表层成分及物相的分析结果表明,经过含φ=0.5%羰基镍的超临界CO2结合超声波处理的铀样品,表层一定深度范围内有镍元素存在。热氧化增重实验证实,经过超声波作用的含羰基镍超临界CO2处理后,铀样品抗大气腐蚀能力比仅用超临界CO2处理有明显增强。

The effect of ultrasound on the efficiency of cleaning contaminants from uranium surface with supercritical carbon dioxide（SCCO2） is studied,and the enhancement of resistibility of uranium against atmospheric corrosion by ultrasonic treatment of uranium in SCCO2 is explored.The experimental results show that the ability and efficiency of SCCO2 in cleaning lubricating oil,water,and triethanolamine are significantly increased.It is indicated by AES and XRD analysis for uranium specimen that nickel has been distributed into a certain depth on their surfaces after they are treated with ultrasound in SCCO2 containing 0.5% nickel tetracarbonyl.TGA reveals that the uranium specimen treated with SCCO2（containing 0.5% Ni（CO）4） in ultrasonic field has a better humid air corrosion resistance than those treated only with SCCO2.