Effect of surface nanocrystallization on the corrosion behavior of Zircaloy-4  

作　　者：ZHU YuTao1,2 & ZHANG XiYan1,2,3 1 College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China 2 National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China 3 School of Physical Science and Engineering Technology, Guangxi University, Nanning 530004, China 

出　　处：《Science China(Technological Sciences)》2009年第8期2227-2231,共5页中国科学（技术科学英文版）

基　　金：Supported by the National Natural Science Foundation of China (Grant No. 50461001);Guangxi Science and Technology Fund (Grant Nos. 0575-18, 0639003);Science Fund of Guangxi University (Grant No. 2005ZD04)

摘　　要：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 ZrO2 are observed in the oxide films, which can delay the martensite phase transition from tetragonal to monoclinic phase in oxide films.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 ZrO2 are observed in the oxide films, which can delay the martensite phase transition from tetragonal to monoclinic phase in oxide films.

关 键 词：NANOCRYSTALLINE ZIRCALOY OXIDE FILM microstructure 

分 类 号：TB383.1[一般工业技术—材料科学与工程]