工程科学学报，第39卷，第3期：399-406,2017年3月 Chinese Journal of Engineering,Vol.39,No.3:399-406,March 2017 DOI:10.13374/j.issn2095-9389.2017.03.012:http://journals.ustb.edu.cn 304不锈钢在模拟压水堆一回路水中高温电化学腐蚀 行为 汪家梅”，陆辉，张乐福四，孟凡江”，徐雪莲》 1)上海交通大学核能科学与工程学院，上海2002402)上海核工程研究设计院，上海200233 ☒通信作者，E-mail:Ifzhang(@sjtu.edu.cn 摘要通过模拟压水堆一回路水环境，研究了氯离子浓度和溶解氧对304不锈钢高温电化学腐蚀行为的影响.动电位极化 曲线结果表明，氯离子浓度主要影响高电位下的二次钝化效应，低电位下影响效果不明显，结合X射线光电子能谱对氧化膜 元素成分的分析发现二次纯化效应与氧化膜中F/Cr元素含量比密切相关.电化学阻抗谱和扫描电镜结果表明，随着氯离子 浓度增加，氧化膜阻抗逐渐降低，表面外层氧化物颗粒和间隙逐渐增大，耐腐蚀性能降低.随着溶解氧含量的升高，304自腐 蚀电位逐渐升高，钝化电流密度降低，钝化区间缩小，表面氧化膜阻抗逐渐增加. 关键词不锈钢：压水堆：高温：电化学：钢腐蚀 分类号TL341 Electrochemical corrosion behavior of 304 stainless steel in simulated pressurized water reactor primary water WANG Jia-mei,LU Hui,ZHANG Le-fu,MENG Fan-jiang?,XU Xue-Hian2 1)School of Nuclear Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China 2)Shanghai Nuclear Engineering Research Design Institute,Shanghai 200233,China Corresponding author,E-mail:Ifzhang@sjtu.edu.cn ABSTRACT The effects of chloride concentration and dissolved oxygen on the high-temperature electrochemical corrosion behaviors of 304 stainless steel sheets were investigated in simulated pressurized water reactor (PWR)primary water.The results of potentiody- namic polarization measurements reveal that the chloride ion mainly affects the second passivation region under high potential,but little effect under low potential.Oxide film chemical content analysis by X-ray photoelectron spectroscopy (XPS)shows that the second pas- sivation properties are closely related to the Fe/Cr ratio of the oxide film.Electrochemical impedance spectroscopy (EIS)and scanning electron microscopy (SEM)results show that,when the chloride ion concentration increases,the oxide film resistance decreases,the size of oxide particles and the gap between oxide particles on the outer layer increases and the corrosion resistance decreases.Besides, with the increase of dissolved oxygen,the corrosion potential increases,the passive current density decreases,the passive potential re- gion shrinks,and the oxide film resistance gradually increases. KEY WORDS stainless steel:pressurized water reactors:high temperature:electrochemistry:steel corrosion 奥氏体不锈钢由于具有良好的机械性能和抗腐蚀抗腐蚀性能，被广泛用于制作核电站一回路主管道和 性能，被广泛用于石油、化工、电力、原子能和核电领 堆芯构件的材料，所以其可靠性对核电站的安全及使 域.其中304不锈钢由于具有良好的机械性能和 用寿命有着至关重要的影响.大量研究表明304等奥 收稿日期：201605-09 基金项目：重大专项CAP1400关键设计技术研究资助项目(2010ZX06002001)工程科学学报，第 39 卷，第 3 期: 399--406，2017 年 3 月 Chinese Journal of Engineering，Vol． 39，No． 3: 399--406，March 2017 DOI: 10． 13374 /j． issn2095--9389． 2017． 03． 012; http: / /journals． ustb． edu． cn 304 不锈钢在模拟压水堆一回路水中高温电化学腐蚀 行为 汪家梅1) ，陆 辉2) ，张乐福1) ，孟凡江2) ，徐雪莲2) 1) 上海交通大学核能科学与工程学院，上海 200240 2) 上海核工程研究设计院，上海 200233  通信作者，E-mail: lfzhang@ sjtu． edu． cn 摘 要 通过模拟压水堆一回路水环境，研究了氯离子浓度和溶解氧对 304 不锈钢高温电化学腐蚀行为的影响． 动电位极化 曲线结果表明，氯离子浓度主要影响高电位下的二次钝化效应，低电位下影响效果不明显，结合 X 射线光电子能谱对氧化膜 元素成分的分析发现二次钝化效应与氧化膜中 Fe /Cr 元素含量比密切相关． 电化学阻抗谱和扫描电镜结果表明，随着氯离子 浓度增加，氧化膜阻抗逐渐降低，表面外层氧化物颗粒和间隙逐渐增大，耐腐蚀性能降低． 随着溶解氧含量的升高，304 自腐 蚀电位逐渐升高，钝化电流密度降低，钝化区间缩小，表面氧化膜阻抗逐渐增加． 关键词 不锈钢; 压水堆; 高温; 电化学; 钢腐蚀 分类号 TL341 Electrochemical corrosion behavior of 304 stainless steel in simulated pressurized water reactor primary water WANG Jia-mei1) ，LU Hui2) ，ZHANG Le-fu1)  ，MENG Fan-jiang2) ，XU Xue-lian2) 1) School of Nuclear Science and Engineering，Shanghai Jiao Tong University，Shanghai 200240，China 2) Shanghai Nuclear Engineering Ｒesearch ＆ Design Institute，Shanghai 200233，China  Corresponding author，E-mail: lfzhang@ sjtu． edu． cn ABSTＲACT The effects of chloride concentration and dissolved oxygen on the high-temperature electrochemical corrosion behaviors of 304 stainless steel sheets were investigated in simulated pressurized water reactor ( PWＲ) primary water． The results of potentiody￾namic polarization measurements reveal that the chloride ion mainly affects the second passivation region under high potential，but little effect under low potential． Oxide film chemical content analysis by X-ray photoelectron spectroscopy ( XPS) shows that the second pas￾sivation properties are closely related to the Fe /Cr ratio of the oxide film． Electrochemical impedance spectroscopy ( EIS) and scanning electron microscopy ( SEM) results show that，when the chloride ion concentration increases，the oxide film resistance decreases，the size of oxide particles and the gap between oxide particles on the outer layer increases and the corrosion resistance decreases． Besides， with the increase of dissolved oxygen，the corrosion potential increases，the passive current density decreases，the passive potential re￾gion shrinks，and the oxide film resistance gradually increases． KEY WOＲDS stainless steel; pressurized water reactors; high temperature; electrochemistry; steel corrosion 收稿日期: 2016--05--09 基金项目: 重大专项 CAP1400 关键设计技术研究资助项目( 2010ZX06002--001) 奥氏体不锈钢由于具有良好的机械性能和抗腐蚀 性能，被广泛用于石油、化工、电力、原子能和核电领 域［1--2］． 其中 304 不锈钢由于具有良好的机械性能和 抗腐蚀性能，被广泛用于制作核电站一回路主管道和 堆芯构件的材料，所以其可靠性对核电站的安全及使 用寿命有着至关重要的影响． 大量研究表明 304 等奥