金属铀热氧化腐蚀的红外和拉曼光谱分析

Infrared and raman spectroscopy analysis of thermal oxidation corrosion of uranium

为了进一步认识金属铀环境腐蚀的规律,采用傅里叶变换红外和显微激光拉曼光谱技术,获得了金属铀与空气热氧化反应产物的红外和拉曼光谱图。实验结果表明,随着温度的升高,铀表面首先出现活性腐蚀亮斑,并逐渐积累长大,主要氧化产物UO2在260℃以上开始转化为U3O8。同时,200℃以上温度条件下,铀表面的热氧化腐蚀速率明显高于较低温度时的氧化反应。研究结果将为改善防腐措施、提高核燃料的安全可靠性提供有价值的参考信息。

For finding out the rides of environmental corrosion of metal uranium, the thermal oxidation reaction of uranium with air was in-situ investigated by infrared and macro laser Raman spectroscopy technique. The experimental results show that some active corroded light spots appear in the surface of uranium at the beginning of heating, and they get together and grow up gradually when heated up under different temperature. The major corrosion product is uranium dioxide （UO2） that begins to change into triuranium octoxide （U3O8） above the temperature of 260℃. At the same time, the thermal oxidation corrosion rates in the surface of uranium at or above 200 ℃are obviously faster than that at the lower temperature. These can provide some valuable reference information for improving anticorrosion measures and increasing safe reliability of nuclear fuels.