锌对316L奥氏体不锈钢氧化膜影响的XPS分析

XPS Analysis of Zinc Injection Effects on Oxide Film of 316 L Stainless Steel

通过模拟压水堆一回路高温高压水化学环境，对316L奥氏体不锈钢进行了10、60和120μg／L锌浓度下的动水加锌实验，用X射线光电子能谱（XPS）对其表面氧化膜结构进行分析．结果表明，加锌能有效降低材料的腐蚀速率，在一定范围内加锌浓度（10～60μg／L）越高，腐蚀增重越小；锌对铁镍尖晶石结构中的Fe^2＋和Ni^2＋有替换作用，形成稳定的ZnCr2O4．

In this paper, the Zn-addition experiments with concentrations of 10μg/L, 60μg/L and 120 μg/L respectively were reported on 316 L stainless steels （SSs） in flowing simulated PWR water. The structures of surface oxide films were analyzed by X-ray photoelectron spectroscopy （XPS）. The results show that the corrosion rate of 316 L SSs could be significantly reduced by adding Zn^2＋ , and in the concentration range of 10 μg/L to 60 μg/L, the corrosion weight gain decreases as Zn concentration increases; it is also indicated that Zn^2＋ is likely to replace Fe^2＋ and Ni^2＋ in Fe-Ni spinel, thus forming a stable ZnCr2O4.