Electrochemical investigation of oxide films formed on nickel alloys 182, 600 and 52 in high temperature water

Figueiredo, Célia de Araújo; Bosch, Rik-Wouter; Vankeerberghen, Marc

doi:10.1016/j.electacta.2011.05.077

Cited by 36 publications

(16 citation statements)

References 14 publications

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“…After immersion in high-temperature water for 500 h, a layer of dense needle-like oxide film appeared, which has been generally observed in Ni-based alloys in PWR water [ 15 , 20 , 36 ]. As displayed in Figure 2(b1) , a decrease in density and thickness of needle-like oxide was evident.…”

Section: Resultsmentioning

confidence: 97%

Effect of Iron Ion on Corrosion Behavior of Inconel 625 in High-Temperature Water

et al. 2020

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The corrosion behavior of an ultralow iron nickel-based alloy Inconel 625 under high-temperature water has been evaluated. The results show that surface oxidation and pitting were the principal corrosion mechanisms of Inconel 625 during the initial immersion period. The surface layer of the oxide film is first Ni-enriched and then Fe-enriched as immersion time increases. The iron ions dissolved from the autoclave could lead to the formation of NiFe2O4 and have a great influence on the oxidation behavior of Inconel 625. The oxides nucleated by solid-state reactions with selective dissolution of Fe and Ni and then grew up through precipitation of cations from solution.

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Section: Resultsmentioning

confidence: 97%

Effect of Iron Ion on Corrosion Behavior of Inconel 625 in High-Temperature Water

et al. 2020

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“…The R sol and Δ E Ω of solutions can also be determined by EIS using both Nyquist and Bode plots at high frequencies (ω → ∞) …”

Section: Resultsmentioning

confidence: 99%

“…Physical and chemical properties of water play a significant role in corrosion processes that occur in aqueous environments. In the case of high‐temperature corrosion of nuclear materials in pressurized water reactors (PWRs) usually simulated primary or secondary coolant water of a PWR are used by corrosion engineers to investigate the resistance of materials used in steam generator tubes, shells, and so forth to different types of corrosion, including general electrochemical corrosion and stress corrosion cracking . The main aim of researchers, in general, is to develop effective programs to select the most suitable metals/alloys and minimize their corrosion rate in operating conditions of the nuclear reactors.…”

Section: Introductionmentioning

confidence: 99%

Water chemistry, solution resistivity, and oxygen reduction reaction in simulated primary coolant of pressurized water reactors

Zhang

Arjmand

2019

Materials & Corrosion

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The effect of temperature (25°C-300°C) on the ohmic potential drop (ΔE Ω ) and resistivity (R sol ) of a simulated primary coolant of the pressurized water reactors was investigated using electrochemical impedance spectroscopy (EIS) and galvanostatic potentiometry. The variations in the conductivity and pH of the solution showed that by increasing the temperature the magnitude of the R sol and therefore ΔE Ω of the system first decreases rapidly (until~150°C) and then reaches a relatively stable plateau value. Increasing the pressure of the system decreased the magnitude of the R sol in the oxygenated coolant. Investigation of the oxygen reduction reaction (ORR) on platinum (Pt), 316L stainless steel (SS), Alloy 690, and carbon steel revealed the great effect of water chemistry, in particular pH on the rate of the ORR on these materials. OH − adsorption on Pt reduced the rate of the ORR on this metal at temperatures higher than~100°C. Finally, it was found that higher H 3 O + concentrations reduce the rate of the ORR on iron-and nickel-based alloys, while increasing the OH − concentration at temperatures higher thañ 150°C accelerates the rate of the ORR on these alloys. K E Y W O R D Shigh-temperature water, iR compensation, primary coolant, solution resistivity

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“…Its electrochemical response during long time immersion is also dominated by the growth kinetics of the oxide film. There have been many studies on growth kinetics of oxide film on alloy surface [14][15][16][17][18][19][20], and they concluded that the electrochemical characteristics varied over time, especially in the initial stage of immersion. Although the high field model (HFM) is initially adopted widely [21,22], it cannot comprehensively interpret the features of oxide film growth, and it does not involve the problem of stable state thickness [23].…”

Section: Introductionmentioning

confidence: 99%

In Situ Electrochemical Study of the Growth Kinetics of Passive Film on TC11 Alloy in Sulfate Solution at 300 °C/10 MPa

Zha

Wang

2020

Materials

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TC11 alloy is a promising structural material, and has a wide range of applications in many corrosive and high temperature hydrothermal systems. The passive film has an important influence on its electrochemical behavior. In this study, in-situ electrochemical methods (that is, open circuit potential (OCP), linear polarization (LP) and electrochemical impedance spectroscopy (EIS)) were used to monitor the long period electrochemical behavior of TC11 alloy in 0.01 M Na2SO4 solution at 300 °C/10 MPa. The growth kinetics of the passive film was mainly studied. The correlation between the evolution of the electrochemical behavior and the growth of the oxide film was discussed. The results showed that although the OCP gradually stabilized after twenty thousand seconds, henceforth the polarization resistance (Rp) was still increasing due to the thickening of the passive film. An equivalent circuit was proposed to fit the EIS experimental data, leading to determination of film capacitance and film resistance. Besides, the electrochemical data was interpreted in terms of the point defect model (PDM). The EIS results are consistent with the Rp results.

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Electrochemical investigation of oxide films formed on nickel alloys 182, 600 and 52 in high temperature water

Cited by 36 publications

References 14 publications

Effect of Iron Ion on Corrosion Behavior of Inconel 625 in High-Temperature Water

Effect of Iron Ion on Corrosion Behavior of Inconel 625 in High-Temperature Water

Water chemistry, solution resistivity, and oxygen reduction reaction in simulated primary coolant of pressurized water reactors

In Situ Electrochemical Study of the Growth Kinetics of Passive Film on TC11 Alloy in Sulfate Solution at 300 °C/10 MPa

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