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利用电化学测试技术、扫描电镜(SEM)及X射线能谱(EDS)对贫铀表面钛镀层的抗腐蚀性能进行了研究。结果表明:在50μg/gCl-的KCl溶液中,钛镀层的腐蚀电位远高于贫铀的腐蚀电位,钛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;贫铀表面完整钛镀层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,完整钛镀层对贫铀具有良好的抗腐蚀保护作用;贫铀表面钛镀层的腐蚀特征为局部腐蚀,由孔蚀向电偶腐蚀转变;破坏的钛镀层将加速铀基体的腐蚀。
The corrosion resistance of titanium coating on depleted uranium surface was studied by electrochemical test, scanning electron microscopy (SEM) and X-ray energy dispersive spectroscopy (EDS). The results show that the corrosion potential of titanium coating is much higher than that of depleted uranium in 50μg / g Cl-KCl solution. Titanium coating is cathodic coating for depleted uranium. The depletion of depleted uranium is based on its physical barrier to corrosive medium. The polarization resistance and electrochemical impedance of complete titanium coating on depleted uranium surface are much larger than that of depleted uranium, and the corrosion current is far less than that of depleted uranium. The intact titanium coating has a good anti-corrosion protection for depleted uranium. The corrosion characteristic of titanium coating on depleted uranium is local corrosion. Pitting corrosion changes to galvanic corrosion; destruction of the titanium coating will accelerate the uranium matrix corrosion.