对压水堆核电站(PWR)常用的316LN不锈钢模拟压水堆一回路条件下,进行加锌浓度为10 ppb和50 ppb的堆外高温动水回路腐蚀实验.实验1 200h后,对316LN不锈钢表面氧化膜进行腐蚀失重分析,采用SEM-EDS观察氧化膜表面形貌和元素分布,XPS进行元素深度分布分析,GIXRD分析氧化膜结构.分析发现,加锌50 ppb样品比加锌10 ppb样品表面形成的氧化膜颗粒更细小,与基体结合更紧密,氧化膜厚度明显减薄,氧化膜晶粒尺寸分布均服从高斯函数规律.加锌后,在氧化膜中形成了更稳定的ZnCr2O4和ZnFe2O4化合物,使得氧化膜处于低能量状态,从而更加稳定,具有更好的保护性.
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