Effect of surface nanocrystallization on the corrosion behavior of Zircaloy-4
Effect of surface nanocrystallization on the corrosion behavior of Zircaloy-4
复制标题
DOI：
10.1007/s11431-009-0201-6
复制
发表时间：
2009-08
期刊：
影响因子：
--
通讯作者：
Yutao Zhu;Xi-Yan Zhang
中科院分区：
文献类型：
--
作者：
Yutao Zhu;Xi-Yan Zhang
在673 K/10.3 MPa的纯水条件下，对表面纳米晶锆-4和粗晶锆-4进行了对比腐蚀实验，并对氧化膜的微观结构进行了研究。结果表明：纳米锆合金表面氧化膜的生长速度低于粗晶锆合金表面氧化膜的生长速度；同时，前者的氧化物/金属界面比后者更规则，更有光泽。对于纳米晶Zircaloy-4，氧通过氧化物/金属界面的扩散速率较低，阻碍了氧离子与金属离子的反应。此外，氧化膜中有更多的方形zro2，这可以延缓氧化膜中马氏体从四方相到单斜相的转变。
The contrastive corrosion experiments between surface nanocrystallined Zircaloy-4 and coarse-grained Zircaloy-4 under the condition of 673 K/10.3 MPa in pure water are carried out, and the microstructure of oxide films has been studied. The results indicate that the growth rate of oxide films formed on the nanocrystalline Zircaloy-4 is lower than that of oxide films formed on the coarse-grained Zircaloy-4. Simultaneously, the oxide/metal interface of the former is more regular and glossy than that of the latter. For nanocrystalline Zircaloy-4, the low oxygen diffusion rate through the oxide/metal interface can hinder the reaction of oxygen ion with metal ion. Furthermore, more tetragonal ZrO2are observed in the oxide films, which can delay the martensite phase transition from tetragonal to monoclinic phase in oxide films.