【摘要】 利用扫描电镜、X射线能谱仪及电化学测试技术对贫铀表面脉冲电镀镍层的腐蚀机理进行了研究。结果表明:在含50μg/g Cl-的KCl溶液中,首先,在铀表面镍镀层的孔隙处发生腐蚀并逐渐扩展到铀/镍界面;腐蚀产物在界面的积累导致镍镀层开裂;镍对铀是一种阴极性镀层,铀镍接触发生电偶腐蚀,镍对铀的保护作用基于镍镀层对腐蚀介质的物理屏障,提高镀层的致密性可改善镍镀层对铀基体的抗腐蚀能力。更多还原

【Abstract】 Corrosion mechanism of nickel deposit on depleted uranium surface prepared by pulse plating was studied by scanning electron microscope （SEM）, X-ray energy dispersion spectroscope （EDS） and electrochemical technology. The results indicate that in potassium chloride solution with 50 μg/g Cl^-, the corrosion of nickel deposit on uranium surface occurs at it’s pit and extends to the interface between uranium and nickel deposit. The （accumulation ） of corrosion product results in the cracking of nickel deposit. Because nickel is a cathodic coating for the uranium matrix, the galvanic corrosion will happen when they contact. The protection of nickel coating to uranium depends on the physical barrier of nickel coating to the corrosive medium. The densification of the nickel coating will （improve ） the corrosion resistant performance of nickel coating to uranium.更多还原