Effect of Water Chemistry on Corrosion Behavior of Nickel-based Alloy 690 in High Temperature High Pressure Water

doi:10.11902/1005.4537.2024.414

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (4): 1035-1040 DOI: 10.11902/1005.4537.2024.414

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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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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.

Key words: nickel-based alloy 690 corrosion high temperature high pressure water dissolved oxygen dissolved hydrogen

Received: 27 December 2024 32134.14.1005.4537.2024.414

ZTFLH:

TL34

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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https://www.jcscp.org/EN/10.11902/1005.4537.2024.414 OR https://www.jcscp.org/EN/Y2025/V45/I4/1035

Fig.1 Microstructure of Ni-based alloy 690

Fig.2 SEM morphologies of oxide scales formed on alloy 690 after 500 h exposure at 290 ℃ in water with different water chemistries: (a1, a2) 3 mg/L DO, (b1, b2) 1 μg/L DO, (c1, c2) 3 mg/L DH

Fig.3 EDS results of the marked regions A (a) and B (b) in Fig.2a2

Fig.4 XRD patterns of oxide scales formed on alloy 690 after 500 h exposure at 290 ℃ in water with different water chemistries

Fig.5 XPS depth profiles of O element in the oxide scales on alloy 690 after 500 h exposure at 290 ℃ in water with different water chemistries

Fig.6 XPS depth profiles of Ni, Cr and Fe elements in the oxide scales formed on alloy 690 after 500 h exposure at 290 ℃ in water with different water chemistries: (a) 3 mg/L DO, (b) 1 μg/L DO, (c) 3 mg/L DH

Fig.7 Detailed XPS spectra of O 1s (a, c) and Cr 2p3/2 (b, d) in oxide scales on alloy 690 exposed at 290 ℃ in water containing 1 μg/L DO (a, b) and 3 mg/L DH (c, d)

Fig.8 Pourbaix diagrams of nickel (a) and chromium (b) species of Fe-Cr-Ni alloys in water at 300 ℃^[18]

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