钼离子注入对锆-4合金耐腐蚀性的影响  

Effect of molybdenum ion implantation on corrosion resistance of zircaloy-4

作　　者：彭德全[1] 白新德[1] 陈小文[1] 周庆刚[1] 刘晓阳[1] 余任泓[1] 

机构地区：[1]清华大学材料科学与工程系,北京100084

出　　处：《核技术》2004年第9期671-675,共5页Nuclear Techniques

基　　金：国家自然科学基金(G2000067207-1);清华大学985课题;清华大学分析中心资助

摘　　要：观察钼离子注入对锆-4合金在硫酸水溶液中耐腐蚀性的影响。使用MEVVA(Metalvaporvacuumarc)源对锆-4合金表面注入1×1016—1×1017cm-2剂量的钼离子,用X射线光电子能谱(XPS)分析其表面元素价态;用三次极化扫描评价其在1mol·L–1硫酸水溶液中的耐腐蚀性;并对三次极化后的样品进行扫描电镜(SEM)观察。实验表明,当钼离子注入剂量小于5×1016cm-2时,注入样品的耐腐蚀性显著增强。当钼离子注入剂量为1×1017cm-2时,注入样品的耐腐蚀性反而比未注入时差。讨论了钼离子注入锆-4合金后耐腐蚀性改变的原因。In order to study the effect of molybdenum ion implantation on the aqueous corrosion behavior of zircaloy-4, specimens were implanted by molybdenum ions with a fluence range of 1×1016—1×1017 cm-2. The valence of the surface layer was analyzed by X-ray photoelectron spectroscopy (XPS) and the three-sweep potentiodynamic polarization measurement was employed to evaluate the aqueous corrosion resistance of zirconium in 1 mol·L–1 H2SO4 solution. Scanning electron microscopy (SEM) was used to observe the surface morphology of the three-sweep potentiodynamic polarized samples. It was found that a significant improvement was achieved in the aqueous corrosion behavior of zircaloy-4 implanted with molybdenum ions when the fluence was smaller than 5× 1016 cm-2. When the fluence was higher than 1×1017 cm-2, the corrosion resistance of zircaloy-4 implanted with molybdenum ions decreased as compared with that of the as-received zircaloy-4. Finally, the mechanism of the corrosion resistance improvement of the molybdenum-implanted zirconium was discussed.

关 键 词：锆-4合金 耐腐蚀性 钼离子注入 三电极动电位极化 极化曲线 

分 类 号：TG146.4[一般工业技术—材料科学与工程]