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Effect of Water Chemistry on Corrosion Behavior of Nickel-based Alloy 690 in High Temperature High Pressure Water |
LI Shunping1,2,3, DANG Ying2,3, HONG Xiaofeng2,3, NING Fangqiang4( ) |
1 College of Material Science and Technology, Southwest Jiaotong University, Chengdu 610031, China 2 National Key Laboratory of Nuclear Reactor Technology, Nuclear Power Institute of China, Chengdu 610213, China 3 State Key laboratory of Advanced Nuclear Energy Technology, Nuclear Power Institute of China, Chengdu 610213, China 4 Shandong Key Laboratory of Special Metallic Materials for Nuclear Equipment, School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China |
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Cite this article:
LI Shunping, DANG Ying, HONG Xiaofeng, NING Fangqiang. Effect of Water Chemistry on Corrosion Behavior of Nickel-based Alloy 690 in High Temperature High Pressure Water. Journal of Chinese Society for Corrosion and protection, 2025, 45(4): 1035-1040.
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Abstract As the key equipment connecting the primary and secondary circuits of PWR nuclear power plants, the corrosion behavior of heat transfer tubes of steam generator (SG) would be affected by different water chemistry. Herein, the effect of dissolved oxygen (DO) and dissolved hydrogen (DH) on the corrosion performance of Nickel-based alloy 690 used as SG tubes in high temperature pressurized water were studied. In comparison with the formed oxide scale of the alloy formed in the high temperature water containing 1 μg/L DO, in the high temperature water containing 3 mg/L DO, the Cr-rich oxides in the formed oxide scale tend to be unstable and easily soluble in water, thus resulting in a thickened scale of loose, porous and non-protective NiO oxides. Furthermore, in the high temperature water containing 3 mg/L DH, DH leads to an increase of Cr(OH)3 and a decrease of Cr2O3 in the formed oxide scales, as a result, the protectiveness of the oxide scales deteriorated, and the oxide scales grew thicker.
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Received: 27 December 2024
32134.14.1005.4537.2024.414
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Fund: National Natural Science Foundation of China(52105372);National Key R&D Program Project(2022YFB4301202-05) |
Corresponding Authors:
NING Fangqiang, E-mail: fqning16b@alum.imr.ac.cn
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