Electrochemical Corrosion Behaviors of Alloy 690 in High-Temperature and Highpressure Water

Abstract

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 hightemperature 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 Xray 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 FeCrNi hydroxide and the inner layer is rich in FeCrNi oxide, is formed on Alloy 690.

Key words: Key words： Alloy 690, pressurized water reactor（PWR), hightemperature electrochemistry, uniform corrosion

CLC Number:

TL 341

WANG Jiamei1，DUAN Zhengang1，ZHANG Lefu1，MENG Fanjiang2，SHI Xiuqiang2. Electrochemical Corrosion Behaviors of Alloy 690 in High-Temperature and Highpressure Water[J]. Journal of Shanghai Jiaotong University, 2016, 50(04): 514-520.

References

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