Effect of O2- additive on the corrosion behavior of Hastelloy N alloy in molten FLiNaK

Liu, Qi; Liu, Xiyan; Hao, Guoqiang; Xu, Hongxia

doi:10.1016/j.corsci.2023.111001

Corrosion Science

2023

DOI: 10.1016/j.corsci.2023.111001

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Effect of O2- additive on the corrosion behavior of Hastelloy N alloy in molten FLiNaK

Qi Liu

Xiyan Liu

Guoqiang Hao

et al.

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Cited by 5 publications

References 25 publications

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High‐Temperature Oxidation Behavior of Hastelloy N Alloy for Molten Salt Reactor at 650–980 °C

Wang,

Li,

et al. 2024

Adv Eng Mater

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Isothermal oxidation of Hastelloy N, a nickel‐based superalloy with low Cr content, is conducted at 650–980 °C in air. The oxide film exhibits a complex structure with outer and inner oxide layers. The outer oxide layer consists of NiO, Fe2O3, NiFe2O4, and MoO2, while NiCr2O4, MnCr2O4, and Cr2O3 are the main phases in the inner oxide layer. At temperatures above 700 °C, the formation of gaseous MoO3 produces cracks and spallation of the outer oxide layer. Moreover, Al2O3 and SiO2 are identified along the grain boundary under the inner oxide layer owing to internal oxidation. The oxidation behavior of Hastelloy N alloy at 650–980 °C is jointly controlled by the chemical reactions at the oxide/alloy interface and the diffusion of Cr3+ and O2− in the bulk alloy. The formation mechanism of each oxide layer is discussed.

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High‐Temperature Oxidation Behavior of Hastelloy N Alloy for Molten Salt Reactor at 650–980 °C

Wang,

Li,

et al. 2024

Adv Eng Mater

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Effect of Cr Content on Hot Corrosion Behavior of Inconel Alloys in Molten LiCl–Li2O

Lim,

Choi,

Kim

et al. 2023

High Temperature Corrosion of mater.

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The hot corrosion behaviors of Inconel alloys with different Cr contents (Inconel 600, 601, and 690), which are used widely in nuclear plants, were investigated in molten LiCl-Li 2 O salts. The hot corrosion behaviors were studied by measuring the mass and attack depth changes, surface and cross-sectional morphologies and elemental distributions, and compositional changes at the subscale and substrate scale as well as the spalled oxide scale. At 288 h, the weight losses of Inconel 601 and Inconel 690 were approximately four and twelve times higher, respectively, than that of Inconel 600. The corrosion products of all tested alloys were Cr 2 O 3 , NiO, and FeCr 2 O 4 . Inconel 600, which exhibited a dense and continuous external corrosion layer and an internal corrosion layer with localized corrosion behavior, exhibited superior corrosion resistance compared with those of Inconel 601 and 690, which showed a spalled external corrosion layer and an internal corrosion layer with uniform corrosion behavior. Thus, the corrosion resistance of the Inconel alloys tested in the hot lithium molten salts in an oxidizing atmosphere is closely related to the contents of the primary alloying elements in the alloys. Of the various

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Effects of reducing impurity addition on corrosion and mechanical properties of structural materials in molten LiF-NaF-KF

Sankar,

Singh

2024

Corrosion Science

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Effect of O2- additive on the corrosion behavior of Hastelloy N alloy in molten FLiNaK

Cited by 5 publications

References 25 publications

High‐Temperature Oxidation Behavior of Hastelloy N Alloy for Molten Salt Reactor at 650–980 °C

High‐Temperature Oxidation Behavior of Hastelloy N Alloy for Molten Salt Reactor at 650–980 °C

Effect of Cr Content on Hot Corrosion Behavior of Inconel Alloys in Molten LiCl–Li2O

Effects of reducing impurity addition on corrosion and mechanical properties of structural materials in molten LiF-NaF-KF

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