Effects of Zinc Addition on the Corrosion Behavior of Pre-Filmed Alloy 690 in Borated and Lithiated Water at 330 °C

Jeon, Soon-Hyeok; Lim, Dong-Seok; Choi, Jeong‐Yoon; Song, Kyu‐Min; Lee, Sang-Kwon; Hur, Do Haeng

doi:10.3390/ma14154105

Cited by 5 publications

(2 citation statements)

References 49 publications

(65 reference statements)

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“…The corrosion behavior of the main contemporary steam generator tube material for PWRs, namely, Alloy 690 (UNS N06690), has been extensively studied in the last decade in a simulated primary coolant [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. The oxide films formed in nominal PWR conditions (~1000 ppm B, ~2 ppm Li, ~20-30 cm 3 kg −1 dissolved H 2 ) are usually described as a duplex oxide layer with a compact inner layer enriched in chromium and a discontinuous outer layer that contains mainly, according to the test facilities, nickel ferrite, nickel chromite and nickel hydroxide [14,16,26,29].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Mechanism and Electrochemical Reactions on Alloy 690 in Simulated Primary Coolant of Water–Water Energy Reactors

Bojinov,

Betova,

Karastoyanov

2024

Materials

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During the power operation of the primary loop of a water cooled–water moderated energy reactor (WWER), the water chemistry evolves from a high-boron high-potassium composition to significantly lower concentrations of both constituents at the end of a campaign, and the Li concentration reaches ca. 0.7–0.9 ppm. In the present paper, the effect of primary water chemistry evolution during operation on the corrosion rate and conduction mechanism of oxides on Alloy 690 is studied by in situ impedance spectroscopy at 300 °C/9 MPa during 1-week exposures in an autoclave connected to a re-circulation loop. At the end of exposure, the samples were anodically polarized at potentials −0.8 to −0.1 V vs. SHE to evaluate the stability of the passive oxide. Simultaneously exposed samples of Alloy 690 were subsequently analyzed by XPS to estimate the thickness and in-depth composition of oxides. Impedance data were quantitatively interpreted using the mixed-conduction model (MCM) for oxide films. The effect of water chemistry evolution on the corrosion rate and conduction mechanism in the oxide on Alloy 690 in a primary coolant is discussed based on the obtained parameters.

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Section: Introductionmentioning

confidence: 99%

Corrosion Mechanism and Electrochemical Reactions on Alloy 690 in Simulated Primary Coolant of Water–Water Energy Reactors

Bojinov,

Betova,

Karastoyanov

2024

Materials

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“…The addition of nickel (Ni 2+ ) or zinc (Zn 2+ ) ions in circulating water is an effective measure to suppress 60 Co deposition in boiling water reactors (BWRs) [3]. The positive effect of Zn 2+ ions on corrosion reduction and prevention of radiation buildup on stainless steel and Alloy 690 have been reported [4][5][6][7]. Zn 2+ ions injection technique is applied in BWRs and pressurised water reactors (PWRs) [8].…”

Section: Introductionmentioning

confidence: 99%

Corrosion behaviour of oxide film formed on carbon steel in high temperature alkaline water in the presence of zinc and magnesium ions

Suresh,

Bera,

Palogi

et al. 2023

Corrosion Engineering, Science and Technology

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Magnetite films on carbon steel are known to reduce corrosion in high temperature aqueous medium. The magnetite films were modified in-situ by introducing Zn and Mg in autoclave by hydrothermal process at 250°C. The film developed in the presence of Zn were thinner with particle size 150 nm after 240 h exposure compared to that developed in the presence of Mg with particle size 223 nm. The depth distribution of Zn and Mg monitored by Rutherford backscattering spectrometry showed that Mg was present more at the top surface, whereas Zn were almost uniform across the depth of the film. Contact angle measurements and electrochemical studies of coated specimens showed an increased corrosion resistance in presence of Zn and Mg in comparison to known passive magnetite layer formed in their absence. It was shown that Zn is a better candidate for corrosion resistance of carbon steel in high temperature aqueous medium.

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Some fundamental understandings of Zn-injection water chemistry on material corrosion in pressurized water reactor primary circuit

Liu

Zhang

et al. 2022

Corrosion Communications

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Effects of Zinc Addition on the Corrosion Behavior of Pre-Filmed Alloy 690 in Borated and Lithiated Water at 330 °C

Cited by 5 publications

References 49 publications

Corrosion Mechanism and Electrochemical Reactions on Alloy 690 in Simulated Primary Coolant of Water–Water Energy Reactors

Corrosion Mechanism and Electrochemical Reactions on Alloy 690 in Simulated Primary Coolant of Water–Water Energy Reactors

Corrosion behaviour of oxide film formed on carbon steel in high temperature alkaline water in the presence of zinc and magnesium ions

Some fundamental understandings of Zn-injection water chemistry on material corrosion in pressurized water reactor primary circuit

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