Electrochemical Corrosion Study of Zircaloy-4 in a LiOH Solution at High Temperature and Pressure

被引：8

作者：

Wang, Zhuo ^{[1
,2
]}

Li, Heping ^{[1
]}

Xu, Liping ^{[1
]}

Liu, Qingyou ^{[1
]}

Zha, Lei ^{[1
,2
]}

Lin, Sen ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Geochem, Key Lab High Temp & High Pressure Study Earths In, Guiyang, Guizhou, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100039, Peoples R China

来源：

INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE | 2018年 / 13卷 / 12期

关键词：

Zircaloy-4; EIS; polarization; corrosion; oxidation; Modeling and Simulation; IMPEDANCE SPECTROSCOPY; ZIRCONIUM ALLOYS; OXIDE-FILMS; PASSIVE ZIRCONIUM; LITHIUM HYDROXIDE; AQUEOUS-SOLUTIONS; WATER; OXIDATION; BEHAVIOR; SN;

D O I：

10.20964/2018.12.20

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The electrochemical corrosion of Zircaloy-4 in simulated pressurized water reactor coolant at 350 degrees C was studied via in situ potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements. The potentiodynamic polarization results indicate that the corrosion potential of Zircaloy-4 decreases and its corrosion current density increases when the concentration of LiOH increases, showing that Zircaloy-4 corrodes more easily and faster in higher concentrations of LiOH. In addition, the EIS data fits the double layer oxide model, which consists of a porous non-protective outer layer and a dense protective inner barrier layer. The EIS data suggest that the corrosion resistance of the two oxide layers both decrease with the increasing LiOH concentration. Our study shows that increasing the LiOH concentration benefits the electrochemical corrosion of Zircaloy-4 in high-temperature and high-pressure aqueous solutions.

引用

页码：12163 / 12171

页数：9

共 38 条

[1] 9TH INTERNATIONAL-SYMPOSIUM ON ZIRCONIUM IN THE NUCLEAR INDUSTRY - NOV 5-8, 1990, KOBE, JAPAN [J].