陆辉,汪家梅,张乐福,孟凡江,石秀强.690合金高温电化学性能研究[J].稀有金属材料与工程,2017,46(10):2969~2974.[LU Hui,WANG Jia-mei,ZHANG Le-fu,MENG Fan-jiang,SHI Xiu-qiang.The Study on High Temperature Electrochemcial Behaviors of Alloy 690[J].Rare Metal Materials and Engineering,2017,46(10):2969~2974.]
690合金高温电化学性能研究
投稿时间:2015-06-23  修订日期:2015-07-14
中文关键词:  690合金  开路电位  交流阻抗谱  动电位极化  热力学分析
基金项目:重大专项CAP1400关键设计技术研究(项目号:2010ZX06002-001)
中文摘要:
      采用开路电位监测、电化学阻抗谱、动电位极化曲线测量和热力学分析等方法,研究690合金在模拟压水堆二次侧高温高压碱性水环境中(氨水调节pH@25℃=9.5)的电化学性能。试验结果表明:在不同温度下(50,100,150,200,250或285℃)的氨水溶液中浸泡20h后,690合金的开路电位都已到达较稳定状态,表面有双层氧化膜生成,随着温度的升高,外层氧化膜阻值先减小后增加,内层氧化膜阻值逐渐减小,而总的氧化膜保护性逐渐降低。再结合试验温度下溶液pH@T的降低,导致690合金的开路电位下降,由极化曲线获得的腐蚀电流密度和维顿电流密度增加。
The Study on High Temperature Electrochemcial Behaviors of Alloy 690
英文关键词:Alloy 690  Open circuit potential  Electrochemical impedance spectroscopy  Potentiodynamic polarization  Thermomechanical analysis
英文摘要:
      The electrochemical behaviors of Alloy 690 was studied in simulated PWR secondary loop high temperature and high pressure alkaline water environments controlling pH (pH@25=9.5) with ammonia-water by measuring open circuit potentials (OCP), electrochemical impedance spectroscopies (EIS), potentiodynamic (PD) polarization curves and thermomechanical analysis. The results showed that: After immersing in ammonia-water at the given temperature (50, 100, 150, 200, 250 or 285℃) for 20h, the OCPs of Alloy 690 have reached a rather steady state and the double-layer oxide films have formed on the Alloy 690. With the increasing temperature, the resistances of outer oxide layer firstly decrease and then increase, while the resistances of the inner oxide layer and the protection of the whole oxide films decrease. In addition, the solution pH@T decreases with the increasing temperature. All of the above causes the decline of OCPs, corrosion current densities and passive current densities from the PD curves.
作者单位E-mail
陆辉 上海交通大学核科学与工程学院 luhui_584@163.com 
汪家梅 上海交通大学核科学与工程学院  
张乐福 上海交通大学核科学与工程学院 lfzhang@sjtu.edu.cn 
孟凡江 上海核工程研究设计院  
石秀强 上海核工程研究设计院  
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