工程科学学报，第39卷，第9期：1355-1363,2017年9月 Chinese Journal of Engineering,Vol.39,No.9:1355-1363,September 2017 DOI:10.13374/j.issn2095-9389.2017.09.008;http://journals.ustb.edu.cn 压水堆一回路主管道316L不锈钢的电化学腐蚀行为 汪家梅，Farzin Arjmand,杜东海，陈凯，赖平，高文华，张浩，郭相龙， 张乐福⑧ 上海交通大学核能科学与工程学院，上海200240 ☒通信作者，E-mail:hang@sjtu.cdu.cn 摘要通过中心复合设计试验法设计试验，结合动电位极化曲线和电化学阻抗谱的测量以及氧化膜形貌观察和成分测量， 研究了温度(30-350℃)、C~质量浓度(10~1000μg·L1)和溶解氧质量浓度(0~200μg·L1)3种因素对压水堆一回路主 管道316L不锈钢电化学腐蚀性能的影响.结果表明：温度是影响316L不锈钢电化学腐蚀性能最显著的因素，温度越高，腐蚀 电流密度越大，点蚀电位越低：Cˉ浓度和溶解氧浓度对316L不锈钢电化学腐蚀性能的影响与温度密切相关，温度较低时 (T<150℃)，C1·浓度和溶解氧浓度均对316L腐蚀电流密度几乎无影响，但点蚀电位却随C1·浓度增加和溶解氧浓度的降低 而降低：温度较高时，分别为T>130℃和T>150℃，C1ˉ浓度和溶解氧浓度均对316L点蚀电位几乎无影响，但腐蚀电流密度 却随ˉ和溶解氧的浓度增加而显著增加，腐蚀加刷.电化学阻抗谱的测量和氧化膜形貌的观察也进一步验证了上述试验 结果. 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 分类号TL341 Electrochemical corrosion behaviors of 316L stainless steel used in PWR primary pipes WANG Jia-mei,FARZIN Arjmand,DU Dong-hai,CHEN Kai,LAI Ping,GAO Wen-hua,ZHANG Hao,GUO Xiang-long, ZHANG Le-fu School of Nuclear Science and Engineering.Shanghai Jiao Tong University,Shanghai 200240,China Corresponding author,E-mail:Ifzhang@situ.edu.cn ABSTRACT The effects of temperature and Cland 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 Cland dissolved oxygen concentrations are highly related to the temperature.When the temperature is relatively low (T<150 C),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 Clconcentration 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 C and T>150 C,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. KEY WORDS 316L stainless steel;electrochemical impedance spectroscopy;high-temperature electrochemical corrosion;central composite design 收稿日期：2016-07-18工程科学学报,第 39 卷,第 9 期:1355鄄鄄1363,2017 年 9 月 Chinese Journal of Engineering, Vol. 39, No. 9: 1355鄄鄄1363, September 2017 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2017. 09. 008; http: / / journals. ustb. edu. cn 压水堆一回路主管道 316L 不锈钢的电化学腐蚀行为 汪家梅, Farzin Arjmand, 杜东海, 陈 凯, 赖 平, 高文华, 张 浩, 郭相龙, 张乐福苣 上海交通大学核能科学与工程学院, 上海 200240 苣 通信作者,E鄄mail: lfzhang@ sjtu. edu. cn 摘 要 通过中心复合设计试验法设计试验,结合动电位极化曲线和电化学阻抗谱的测量以及氧化膜形貌观察和成分测量, 研究了温度(30 ~ 350 益 )、Cl - 质量浓度(10 ~ 1000 滋g·L - 1 )和溶解氧质量浓度(0 ~ 200 滋g·L - 1 ) 3 种因素对压水堆一回路主 管道316L 不锈钢电化学腐蚀性能的影响. 结果表明:温度是影响316L 不锈钢电化学腐蚀性能最显著的因素,温度越高,腐蚀 电流密度越大,点蚀电位越低;Cl - 浓度和溶解氧浓度对 316L 不锈钢电化学腐蚀性能的影响与温度密切相关,温度较低时 (T < 150 益 ),Cl - 浓度和溶解氧浓度均对 316L 腐蚀电流密度几乎无影响,但点蚀电位却随 Cl - 浓度增加和溶解氧浓度的降低 而降低;温度较高时,分别为 T > 130 益和 T > 150 益 ,Cl - 浓度和溶解氧浓度均对 316L 点蚀电位几乎无影响,但腐蚀电流密度 却随 Cl - 和溶解氧的浓度增加而显著增加,腐蚀加剧. 电化学阻抗谱的测量和氧化膜形貌的观察也进一步验证了上述试验 结果. 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 分类号 TL341 收稿日期: 2016鄄鄄07鄄鄄18 Electrochemical corrosion behaviors of 316L stainless steel used in PWR primary pipes WANG Jia鄄mei, FARZIN Arjmand, DU Dong鄄hai, CHEN Kai, LAI Ping, GAO Wen鄄hua, ZHANG Hao, GUO Xiang鄄long, ZHANG Le鄄fu 苣 School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China 苣 Corresponding author, E鄄mail: lfzhang@ sjtu. edu. cn ABSTRACT The effects of temperature and Cl - and dissolved oxygen (DO) concentrations on the electrochemical corrosion behav鄄 iors of 316L stainless steel used in pressurized water reactor primary pipes were investigated via a composite design strategy, potentio鄄 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 益 ), 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 益 and T > 150 益 , 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. KEY WORDS 316L stainless steel; electrochemical impedance spectroscopy; high鄄temperature electrochemical corrosion; central composite design