Ar^+离子辐照对锆4合金耐腐蚀性能的影响  

Effect of Ar^+ ions irradiation on corrosion resistance of zircaloy 4

作　　者：刘晓阳[1] 白新德[2] 万千[1] 陈宝山 伍志明 

机构地区：[1]清华大学工程物理系,北京100084 [2]清华大学材料科学与工程系,北京100084 [3]四川宜宾核燃料元件厂,宜宾644000

出　　处：《核技术》2004年第4期269-272,共4页Nuclear Techniques

摘　　要：为了研究辐照损伤对锆4合金电化学耐腐蚀性能的影响,使用直线加速器产生单电荷载能Ar+,在液氮温度下辐照样品表面,产生缺陷。然后,测量辐照后锆4合金的电化学极化曲线,使用钝化电流密度作为评定腐蚀性能的指标,分析不同注量Ar+离子辐照对锆4合金钝化电流密度的影响。同时使用透射电子显微镜分析不同注量Ar+辐照下锆4合金损伤层的微观结构。实验结果表明:在低离子注量范围内(<3×1014/cm2),随着辐照量的增加钝化电流密度升高,耐腐蚀性能降低,在中等离子注量范围内(3×1014—1×1016/cm2),随着辐照量的增加钝化电流密度急速下降,耐腐蚀性能显著提高,在高离子注量范围内(1×1016—1×1017/cm2),随着辐照量的增加钝化电流密度又开始增加,耐腐蚀性能再次降低。最后,根据原子碰撞理论对实验结果进行了理论分析。In order to investigate the ion irradiation effect on the corrosion resistance of zircaloy 4, specimens were irradiated by Ar+ ions using an accelerator of 150 keV at a dose range from 3×1013 to 1×1017 /cm2 and at liquid nitrogen temperature. Post-irradiation corrosion tests were conducted by potentiodynamic polarization measurement in a 0.5 mol/L H2SO4 water solution at room temperature. Transmission electron microscopy (TEM) was employed to examine the change of microstructures in the irradiated surface. The potentiodynamic tests showed that with the irradiation dose increasing, the surface passive current density underwent three stages: increased, decreased and increased once again. The mechanism of the corrosion resistance transformation was attributed to defect accumulation, amorphous phase formation and recrystallinization in the irradiated surface.

关 键 词：锆4合金 Ar^+离子辐照 辐照损伤 耐腐蚀性能 

分 类 号：TG146.4[一般工业技术—材料科学与工程] TG174.3[金属学及工艺—金属材料]