Repassivation behavior of alloy 690TT in simulated primary water at different temperatures  

作　　者：Ji Liu Jianqiu Wang Zhiming Zhang Hui Zheng 

机构地区：[1]Key Laboratory of Nuclear Materials and Safety Assessment,Liaoning Key Laboratory for Safety and Assessment Technique of Nuclear Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang,110016,China [2]School of Materials Science and Engineering,University of Science and Technology of China,Shenyang,110016,China [3]State Nuclear Power Plant Service Company,Shanghai,200233,China

出　　处：《Journal of Materials Science & Technology》2021年第9期227-235,共9页材料科学技术（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (No. 51771211);the Key Research Program of Frontier Sciences;the Chinese Academy of Sciences(No. QYZDY-SSWJSC012);the Key Program of the Chinese Academy of Sciences (No. ZDRW-CN-2017-1);the National Science and Technology Major Project (No. 2015ZX06002005)。

摘　　要：The repassivation behavior of Alloy 690 T T in simulated primary water at different temperatures was investigated by the rapid scratching electrode technique together with electrochemical measurements.The results showed that the repassivation process had three stages: the initial stage conformed to the place exchange model, the final stage conformed to the high field ion conduction model and in between there was a transition stage. At the initial stage, when the repassivation process of alloys was controlled by the place exchange model, anodic dissolution of substrate was dominated;after the film coverage rate was more than 0.99, the repassivation process of alloys was controlled by high field ion conduction model. Increasing the temperature resulted in a reduction of the repassivation rate and protectiveness of the passive film. The correlations among several mechanisms describing the repassivation behavior of alloys were discussed.

关 键 词：REPASSIVATION ELECTROCHEMISTRY High temperature corrosion Alloy 690TT Electrochemical impedance spectroscopy 

分 类 号：TG146.15[一般工业技术—材料科学与工程]