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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(英文),2017,46(10):2969~2974.[LU Hui,WANG Jia-mei,ZHANG Le-fu,MENG Fan-jiang and SHI Xiu-qiang.The Study on High Temperature Electrochemcial Behaviors of Alloy 690[J].Rare Metal Materials and Engineering,2017,46(10):2969~2974.]
The Study on High Temperature Electrochemcial Behaviors of Alloy 690
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Received:June 23, 2015  Revised:July 14, 2015
Key words: Alloy 690  Open circuit potential  Electrochemical impedance spectroscopy  Potentiodynamic polarization  Thermomechanical analysis
Foundation item:重大专项CAP1400关键设计技术研究(项目号:2010ZX06002-001)
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LU Hui,WANG Jia-mei,ZHANG Le-fu,MENG Fan-jiang and SHI Xiu-qiang  
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      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.