Corrosion of nickel-base alloys in primary medium of pressurized water reactors: New insights on the oxide growth mechanisms and kinetic modelling

Marchetti, L.; Perrin, Stéphane; Jambon, Fanny; Pijolat, Michèle

doi:10.1016/j.corsci.2015.09.001

Cited by 56 publications

(26 citation statements)

References 44 publications

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“…Similarly, Kim et al[40] measured on pure Cr in a 8.5 pH borate solution, two gap energies at 2.75 and 3.0 eV, which were attributed to Cr(OH)3 and CrOOH, respectively. Nevertheless, some other works attributed a band gap of 2.5 eV to the Cr(OH)3 compound[34] [37][41].Thus, the photoelectrochemical response of the passive film formed on the MP and the AR Alloy 690, mainly originates from NiO with minor contributions of Cr 2 O 3 and Ni-Cr hydroxides. These results are in agreement with some previous works on Ni-based alloys at room temperature[15] [42].The AR alloy exhibited a fourth photoelectrochemical contribution leading to a band gap of about 4.8 eV, which can be ascribed to the presence of the mixed spinel Ni(Fe,Cr) 2 O 4 .…”

mentioning

confidence: 70%

“…On the other hand, the internal sub-layer of the oxide film formed on the Alloy 690 at high temperature is composed of Cr 2 O 3 and mixed Ni-Fe-Cr spinel through which the transport of mainly Ni and Fe species contributing to the oxide growth occurs through a solid state process [3]. It is believed that the internal layer is formed by an anionic diffusion process along a short-circuit network such as grain boundaries [2].…”

Section: Discussionmentioning

confidence: 99%

“…Hermet et al[38] attributed to the β-Ni(OH) 2 a band gap equal to 2.9 eV. Similarly, Kim et al[40] measured on pure Cr in a 8.5 pH borate solution, two gap energies at 2.75 and 3.0 eV, which were attributed to Cr(OH)3 and CrOOH, respectively. Nevertheless, some other works attributed a band gap of 2.5 eV to the Cr(OH)3 compound[34] [37][41].Thus, the photoelectrochemical response of the passive film formed on the MP and the AR Alloy 690, mainly originates from NiO with minor contributions of Cr 2 O 3 and Ni-Cr hydroxides.…”

mentioning

confidence: 89%

“…The electrochemical and the oxide film properties have been extensively studied in order to understand the mechanism of Ni release from Ni-base Alloys and elucidate the growth mechanism of the oxide film at high temperature and high pressure [3] [4] [5]. The oxide film formed within the PWR media is generally described as a duplex oxide layer with an inner layer enriched in Cr and an outer layer that contains mainly nickel ferrite and nickel hydroxide [5] [6].…”

Section: Introductionmentioning

confidence: 99%

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Temperature dependence of the electrochemical behavior of the 690 Ni-base alloy between 25 and 325 °C

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Bricault

Cachet

et al. 2019

Electrochimica Acta

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et al.. Temperature dependence of the electrochemical behavior of the 690 Ni-base alloy between 25 and 325 °C. Electrochimica Acta, Elsevier, 2019, 317, pp. AbstractThe electrochemical behavior and the chemical composition of passive films formed on the Alloy 690 at room temperature in borate buffer solution (pH = 9.0) was studied with different techniques for two surface finishings. XPS and quantum yield measurements showed the presence of Ni and Cr oxides and hydroxides for passive films formed on both the as received and the mechanically polished one, whereas the presence of mixed spinel type Ni (1-x) Fe x Cr 2 O 4 was only observed on the as received material. Additionally, Electrochemical Impedance Spectroscopy (EIS) highlighted a higher corrosion resistance for the as received alloy in comparison with the mechanically polished alloy, which was linked to the chemical composition of the oxide film. Electrochemical measurements were performed before, during, and after oxidation of the Alloy 690 of Steam Generator (SG) tube of Pressurized Water Reactor (PWR) at high temperature and high pressure in the simulated primary circuit of PWR. At high temperature, the interface becomes electrochemically active yielding the precipitation of the corrosion products which form a few tens of nm thick diffusion barrier for the released metal cations. This overlayer is built on the top of a few nm thick, Cr rich inner layer at the alloy/oxide interface which was found to behave similarly to that initially formed at ambient temperature. It is concluded that high temperature oxidation in the static condition of an autoclave at 325°C does not promote a better passivation state than the one already existing initially.

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confidence: 70%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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Temperature dependence of the electrochemical behavior of the 690 Ni-base alloy between 25 and 325 °C

Euch

Bricault

Cachet

et al. 2019

Electrochimica Acta

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“…In these two types of media, it is well known that the structure and thickness of the oxide scale can be strongly affected by surface preparations applied prior to medium exposure whether in the case of Fe- [7,[14][15][16][17][18][19] or Ni-based alloys [8,20,21]. Under SCW conditions, Tan et al [19] observed the beneficial influence of shot-peening on the oxidation of alloy 800 H at 500°C and 25 MPa in comparison to results obtained from polish samples.…”

Section: Introductionmentioning

confidence: 99%

Corrosion mechanisms of 316L stainless steel in supercritical water: The significant effect of work hardening induced by surface finishes

et al. 2019

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The oxidation of 316 L stainless steel in hydrogenated supercritical water at 600°C is strongly dependent on the effects of work hardening induced by surface finishes. The oxide scale formed under these conditions is always double-layered with an external layer of Fe-rich oxides. However, when a hardening threshold is reached, a switch in oxidation mechanisms leads to a considerable thinning of the oxide scale. This thinning results from the formation of a Cr-rich internal oxide layer that acts as a diffusion barrier against ionic species responsible for its growth but also against Fe cations implied in the external layer growth.

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Effect of alloying elements on aqueous corrosion of nickel‐based alloys at high temperatures: A review

Karimihaghighi

Naghizadeh

2023

Materials & Corrosion

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Nickel-based alloys are well-known multicomponent alloys with a composition carefully balanced to provide the desired properties for various industrial applications. While these alloys are corrosion resistant, under severe conditions corrosion can still occur, which can result in serious damage to a system in operation. To improve their reliability, the composition of nickelbased alloys can be tailored to particular operating conditions. To improve their corrosion resistance, alloying elements such as chromium, molybdenum (+tungsten), and copper can be added, which promote the oxide formation process and thereby contribute to oxide passivity. This paper reviews and draws conclusions from existing literature on nickel-based alloy corrosion and oxide formation in high-temperature environments.

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Corrosion of nickel-base alloys in primary medium of pressurized water reactors: New insights on the oxide growth mechanisms and kinetic modelling

Cited by 56 publications

References 44 publications

Temperature dependence of the electrochemical behavior of the 690 Ni-base alloy between 25 and 325 °C

Temperature dependence of the electrochemical behavior of the 690 Ni-base alloy between 25 and 325 °C

Corrosion mechanisms of 316L stainless steel in supercritical water: The significant effect of work hardening induced by surface finishes

Effect of alloying elements on aqueous corrosion of nickel‐based alloys at high temperatures: A review

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