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

Ji Liu ¹Jianqiu Wang ²Zhiming Zhang ²Hui Zheng³

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作者信息

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;School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China
2. 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
3. State Nuclear Power Plant Service Company, Shanghai, 200233, China
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Abstract

The repassivation behavior of Alloy 690TT 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.

Key words

Repassivation/Electrochemistry/High temperature corrosion/Alloy 690TT/Electrochemical impedance spectroscopy

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基金项目

This work is financially supported by the National Natural Science Foundation of China(51771211)

Key Research Program of Frontier Sciences,the Chinese Academy of Sciences(QYZDY-SSWJSC012)

Key Program of the Chinese Academy of Sciences(ZDRW-CN-2017-1)

National Science and Technology Major Project(2015ZX06002005)

出版年

2021

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI

影响因子：0.657

ISSN：1005-0302

参考文献量75

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