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| Electrochemical Corrosion Behaviors of Alloy 690 in High-Temperature and Highpressure Water |
| WANG Jiamei1，DUAN Zhengang1，ZHANG Lefu1，MENG Fanjiang2，SHI Xiuqiang2
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| (1. School of Nuclear Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China；2. Shanghai Nuclear Engineering Research and Design Institute， Shanghai 200233, China) |
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Abstract Abstract： The effects of temperature (25 to 285°C) and dissolved oxygen(20 μg/L, 2.1 mg/L, 8.4 mg/L) on hightemperature electrochemical corrosion behaviors of Alloy 690, and the uniform corrosion behaviors of Alloy 690 were investigated in stimulated pressurized water reactor (PWR) primary water. The results of potentionamic polarization measurements and Xray photoelectron spectroscopy (XPS) reveal that the corrosion potential(Ecorr) decreases, the corrosion current density(Icorr) increases, and the passive potential region shrinks with the increase of temperature while the corrosion potential increases, the corrosion current density decreases, and the passive potential region shrinks with the increase of DO. The uniform corrosion rate of Alloy 690 exposed in investigated conditions is 0.244 mg/(dm2·h1/2),and the oxide, of which the outer layer is rich in FeCrNi hydroxide and the inner layer is rich in FeCrNi oxide, is formed on Alloy 690.
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Received: 09 April 2015
Published: 28 April 2016
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