工程科学学报2017，Vol.39Issue(9)：1355-1363,9.DOI:10.13374/j.issn2095-9389.2017.09.008
压水堆一回路主管道316 L不锈钢的电化学腐蚀行为
Electrochemical corrosion behaviors of 316 L stainless steel used in PWR primary pipes
汪家梅 1Farzin Arjmand 1杜东海 1陈凯 1赖平 1高文华 1张浩 1郭相龙 1张乐福1
作者信息
- 1. 上海交通大学核能科学与工程学院, 上海 200240
- 折叠
摘要
Abstract
The effects of temperature and Cl- and dissolved oxygen ( DO) concentrations on the electrochemical corrosion behav-iors of 316L stainless steel used in pressurized water reactor primary pipes were investigated via a composite design strategy, potentio-dynamic polarization and electrochemical impedance spectroscopy measurements, and oxide film morphology observation. The results reveal that temperature is the most significant factor affecting the corrosion behavior of the steel:the higher the temperature, the higher the corrosion current density and the lower the pitting potential of the steel. The effects of Cl- and dissolved oxygen concentrations are highly related to the temperature. When the temperature is relatively low ( T<150℃) , relationships between the Cl- and dissolved oxygen concentrations and corrosion current density of the steel are hardly observed, although the pitting potential decreases with increasing Cl- concentration and decreasing dissolved oxygen concentration. As the temperature increases, the dependence of pitting potential on the Cl- and dissolved oxygen concentrations disappears ( at T>130℃ and T>150℃, respectively) , and the corrosion current density increases with increasing Cl- and dissolved oxygen concentrations. The electrochemical impedance spectroscopy ( EIS) measurements and oxide film observations further confirmed these experimental results.关键词
316L不锈钢/电化学阻抗谱/高温电化学腐蚀/中心复合试验法Key words
316L stainless steel/electrochemical impedance spectroscopy/high-temperature electrochemical corrosion/central composite design分类
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汪家梅,Farzin Arjmand,杜东海,陈凯,赖平,高文华,张浩,郭相龙,张乐福..压水堆一回路主管道316 L不锈钢的电化学腐蚀行为[J].工程科学学报,2017,39(9):1355-1363,9.
