摘要
利用电化学测试技术、扫描电镜(SEM)及X射线能谱(EDS)对磁控溅射离子镀铌贫铀的电化学腐蚀行为进行了研究。实验结果表明:在50μg/gCl-的KCl溶液中,铌的腐蚀电位远高于贫铀的腐蚀电位,铌镀层对贫铀是阴极性镀层,对贫铀的保护是基于其对腐蚀介质的物理屏障作用;镀铌贫铀的极化电阻和电化学阻抗幅值远大于贫铀,腐蚀电流远小于贫铀,铌镀层对贫铀具有良好的防腐蚀性能;镀铌贫铀的腐蚀特征为局部腐蚀,并由孔蚀向电偶腐蚀转变。
Electrochemical corrosion behaviors of depleted uranium coated with niobium deposited by magnetron sputter ion plating were studied by electrochemical technology, scanning electron microscope （SEM） and X-ray energy dispersive spectroscope （EDS）. The results indicate that the corrosion potential of niobium is much higher than that of depleted uranium in 50 μg/g Cl^- potassium chloride solution Niobium coating is cathodic against depleted uranium. The protection of niobium coating to depleted uranium depends on physical barrier to corrosive medium. The depleted uranium coated with niobium has much higher polarization resistance, greater magnitude of electrochemical impedance and much lower corrosion current compared with depleted uranium. The niobium coating has excellent corrosion resistant property to depleted uranium. Corrosion feature of the depleted uranium coated with niobium is typical local corrosion and changes from pit corrosion to galvanic corrosion.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2008年第2期289-293,共5页
Rare Metal Materials and Engineering
基金
中国工程物理研究院科学技术基金委员会"双百人才基金"资助(2005R0806)
关键词
贫铀
铌镀层
磁控溅射离子镀
电化学腐蚀
depleted uranium
niobium coating
magnetron sputter ion plating
electrochemical corrosion
