贫铀表面碳氧离子注/渗及其抗蚀性能研究

The Corrosion Resistance of Depleted Uranium with Implantation of C and O Ion

利用离子注 /渗方法 ,将CO2 气体离解后 ,在不同能量、束流、温度下注入贫铀表面 ,利用SEM、XPS和XRD等技术分析了改性层厚度、表面元素化学态以及表面改性层的相结构。用室温贮存实验和电化学方法对注入样品的腐蚀性能进行了考核。结果表明 ,在高能量、小束流下离子注入得到的改性层薄 ;在低能量、大束流下离子注入得到的改性层厚 ,注入样品表面是以大量UO2 和少量石墨碳的形式存在。碳离子注入能量存在一极限值 ,当能量较小时 ,可导致碳无法注入样品内部。腐蚀实验考核表明 ,贫铀表面注入C、O离子后 ,在表面形成单一的UO2 氧化膜 。

C and 0 ions with different energy, beam current at different temperatures after CO 2 is decomposed are implanted to the depleted uranium by ion implantation and permeation. The technologies such as AES, XPS and XRD are used to study the thickness, chemical states and phase structures of modified layers. The corrosion properties of the samples are investigated by storage experiment at ambient and electrochemical polarization .The results indicate that thickness of layer prepared at larger energy, smaller beam current ion implantation condition is thinner than that of layer at small energy, larger beam current ion implantation condition. The surface of implanted sample consists of mostly UO 2 and a small fraction C. The carbide ion can' t be implanted into sample when ion energy is under an energy limit value. The corrosion experiments indicate that the implanted samples have better anticossion properties because of the thicker UO 2 layer on the surface.