High-temperature corrosion behavior of Ni–16Mo–7Cr–4Fe superalloy containing yttrium in molten LiF–NaF–KF salt

Li, Xiaoli; He, Shangming; Zhou, Xingtai; Huai, Ping; Li, Zhijun; Li, Aiguo; Yu, Xiaohan

doi:10.1016/j.jnucmat.2015.05.007

Cited by 30 publications

(4 citation statements)

References 10 publications

(15 reference statements)

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“…22 Specifically, during the electrolytic reduction of spent oxide nuclear fuel in a molten lithium salt system containing highly corrosive and strongly basic Li 2 O, the oxygen generated at the anode and resulting high-temperature molten lithium salt can lead to a chemically aggressive environment, which is excessively corrosive for ordinary structural materials. 2,[24][25][26][27][28] Hence, studies on the hot corrosion of Ni-base alloys, which are used to fabricate the equipment related to the handling of high-temperature molten salts owing to their excellent resistance to corrosion at elevated temperatures, [29][30][31][32][33][34][35] have been conducted. In addition, long-term corrosion resistance is an important parameter, which is used to determine the suitability of structural materials requiring continuous exposure to high-temperature molten salts.…”

Section: Introductionmentioning

confidence: 99%

Effect of reaction temperature on the corrosion behaviour of Inconel alloys in lithium molten salt under an oxidising atmosphere

Choi,

Lim,

Kim

et al. 2024

Corrosion Engineering, Science and Technology: The Internationa

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The effect of temperature on the corrosion behaviour of Inconel alloys employed for the electroreduction of metal oxides to metals in a lithium molten salt was investigated. The ratio of the weight loss of Inconel 601 and 690 to that of Inconel 600, Inconel 601 and 690 was approximately four and six at 650 °C, and five and eight times higher than that of Inconel 600 above 750 °C for 72 h, respectively. The corrosion products of all the alloys tested at 650 °C and 750 °C for 72 h were mainly Cr2O3 and FeCr2O4; however, only Cr2O3 was obtained when Inconel 690 was corroded at 750 °C or higher. Additionally, an alloy with a composition of max. 16.3 wt.% Cr, min. 73.66 wt.% Ni and well below 8.15 wt.% Fe was expected to exhibit excellent corrosion resistance in a lithium molten salt system at 650–850 °C.

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Section: Introductionmentioning

confidence: 99%

Effect of reaction temperature on the corrosion behaviour of Inconel alloys in lithium molten salt under an oxidising atmosphere

Choi,

Lim,

Kim

et al. 2024

Corrosion Engineering, Science and Technology: The Internationa

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“…uoride [15][16][17][18], and carbonate systems [19][20][21][22][23]. In addition, Ni-based alloys are being used in hightemperature applications because of their excellent resistance against corrosion at elevated temperatures [24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

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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“…Hence, numerous studies have been conducted to understand the corrosion of the structural materials used for handling high-temperature molten salts, such as sulfates [15,16], carbonates [17,18], fluoride [19][20][21], and chloride systems [22,23]. Superalloys have been developed as a structural material for devices using high-temperature molten salts, and studies on their high-temperature corrosion characteristics are being continuously conducted [24][25][26][27][28][29][30][31]. However, according to previous studies, this type of alloy may not be able to simultaneously fulfil the criteria of high-temperature strength and corrosion resistance when placed in a high-temperature electrolyte containing oxygen and a strongly corrosive lithium molten salt [12,31].…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Corrosion Behavior of Al-Coated Ni-Base Alloys in Lithium Molten Salt for Electroreduction

et al. 2021

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The electrolytic reduction of a spent oxide fuel involves the liberation of oxygen in a molten salt LiCl–Li2O electrolyte, which creates a corrosive environment for typical structural materials. In this study, the corrosion behaviors of Al–Y-coated specimens in a Li molten salt kept under an oxidizing atmosphere at 650 °C for 72 and 168 h were investigated. The weight loss fraction of the coated specimen to bare specimen was approximately 60% for 3% Li2O and 54% for 8% Li2O at 72 h, and approximately 38% for 3% Li2O and 30% for 8% Li2O at 168 h. Corrosion was induced in the LiCl–Li2O molten salt by the basic oxide ion O2− via the basic flux mechanism, and the corrosion product was found to be dependent on the activity of the O2− ion. The increase in weight loss may have been caused by the increase in the O2− concentration due to the increase in the Li2O concentration rather than being because of the increased reaction time. The Al–Y coating was found to be beneficial for hot corrosion resistance, which can be useful for handling high-temperature lithium molten salt under an oxidizing atmosphere.

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High-temperature corrosion behavior of Ni–16Mo–7Cr–4Fe superalloy containing yttrium in molten LiF–NaF–KF salt

Cited by 30 publications

References 10 publications

Effect of reaction temperature on the corrosion behaviour of Inconel alloys in lithium molten salt under an oxidising atmosphere

Effect of reaction temperature on the corrosion behaviour of Inconel alloys in lithium molten salt under an oxidising atmosphere

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

High-Temperature Corrosion Behavior of Al-Coated Ni-Base Alloys in Lithium Molten Salt for Electroreduction

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