Effects of silicon carbide on the corrosion of metallic materials in molten LiF-NaF-KF salt

Xue, Wandong; Yang, Xinmei; Ye, Xiang‐Xi; Han, Ling; Wang, Jianqiang; Ignatiev, V.; Zhou, Xingtai

doi:10.1016/j.corsci.2018.08.023

Cited by 15 publications

(6 citation statements)

References 32 publications

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“…In such complex and extreme environments, a thorough understanding of structural, dynamical, and thermodynamic properties of the melt is fundamentally important. Significant recent work has been done on fluoride-based molten salt mixtures, − but it is the chlorides, including those subject of this article, which are seen as particularly relevant to next-generation nuclear reactors − and concentrated solar power . If we consider the early work of Roshenhein and Zachariasen, there is almost a century of work attempting to address the structure and dynamics of networked liquids.…”

Section: Introductionmentioning

confidence: 99%

Temperature Dependence of Short and Intermediate Range Order in Molten MgCl₂ and Its Mixture with KCl

Sharma

Roy

et al. 2020

J. Phys. Chem. B

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This article addresses the non-Debye−Waller temperature behavior in the intermediate range order for molten MgCl 2 and its mixtures with KCl from a theory, Molecular Dynamics, and experimental X-ray scattering perspective and puts these findings in the context of discussions and controversies extending at least four decades. We find that these liquids are defined by two structural motifs. The first motif is associated with chains of positive−negative charge alternation; the second motif, which results in a prepeak in the structure function S(q), is associated with the interaction of Mg 2+ and Cl − ions that do not belong to the same charge alternation chain or aggregate. Our complementary X-ray scattering and computational results provide a quantitative explanation for the increase in intensity of the prepeak with temperature as opposed to the behavior of other peaks following normal Debye−Waller behavior. Temperature has opposite effects on the prevalence of each of the two structural motifs, and the enhancement of one pattern appears to be at the detriment of the other. Whereas the intensity in S(q) associated with the charge alternation motif is diminished at higher temperature, the opposite is true for the prepeak associated with intermediate range order due to the second structural motif.

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Section: Introductionmentioning

confidence: 99%

Temperature Dependence of Short and Intermediate Range Order in Molten MgCl₂ and Its Mixture with KCl

Sharma

Roy

et al. 2020

J. Phys. Chem. B

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“…The corrosion resistance of molten-salt-resistant structural materials depends on the material composition, molten salt composition, and molten salt purity. These factors reflect the thermodynamic driving force of the alloy elements dissolving into molten salt and diffusion rate of the alloy elements from the matrix to the surface [12][13][14] . Because the operating temperature of molten salt is significantly higher than that of a conventional heat transfer medium, alloy materials under the action of molten salt experience performance-limiting conditions, whereby small environment fluctuations lead to significant changes in the material structure and properties 15,16 .…”

Section: Introductionmentioning

confidence: 99%

Stress-assisted corrosion behaviour of Hastelloy N in FLiNaK molten salt environment

Zhang

et al. 2022

npj Mater Degrad

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The use of molten-salt–based energy production and storage systems requires high-temperature corrosion- and creep-resistant structural materials. This study investigated the microstructure evolution and corrosion characteristics of Hastelloy N under working stress in a molten salt environment. Selective diffusion of Cr at the grain boundaries (GBs) of the Hastelloy N degraded the properties of the GBs, making them preferred locations for corrosion crack invasion. Stress further promoted Cr diffusion and accelerated GB carbide precipitation, thereby forming a corrosion couple between the carbide and matrix that facilitated the expansion of intergranular corrosion cracks into the grains. These findings are useful for providing advances in the design of novel structural alloys with extraordinary property-microstructure stability combinations for resistant to complex molten salt environments.

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“…This is in part due to the high chance that some of the new nuclear power plants that may replace older facilities will be based on molten salt reactors (MSRs). In these, molten salts and their mixtures are used as fuel or as a coolant due to multiple advantageous properties including, but not limited to, their high heat capacity and boiling points. − Such type of reactors were demonstrated viable in the early 1950s at Oak Ridge National Laboratory (ORNL). , A significant amount of work on the fluoride-based salts ,,− such as FLiBe and FLiNaK has taken place in the past few years; however, there has been an increasing degree of interest in chloride salts for MSRs. − For the chlorides, polarizable models with quantum-mechanical accuracy have been recently developed, − and it is using these that structural and transport properties ought to be better explored; yet, it is often the case that extensive sampling, particularly for transport properties, using such models is simply prohibitive.…”

Section: Introductionmentioning

confidence: 99%

SEM-Drude Model for the Accurate and Efficient Simulation of MgCl₂–KCl Mixtures in the Condensed Phase

Sharma

Emerson

et al. 2020

J. Phys. Chem. A

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There is a long history of models that to different extents reproduce structural and dynamical properties of high-temperature molten salts. Whereas rigid ion models can work fairly well for some of the monovalent salts, polarizability is fundamentally important when small divalent or multivalent cations are combined with significantly polarizable anions such as Cl– to form networked liquids that display a first sharp diffraction peak. There are excellent polarizable ion models (PIMs) for these systems, but there has been little success with the less expensive Core–Shell type models, which are often described as unwieldy or difficult to fit. In this article, we present the Sharma–Emerson–Margulis (SEM)-Drude model for MgCl2/KCl mixtures that with the same ingredients used in the latest and most accurate PIM models overcome the aforementioned obstacles at significantly less computational cost; structural and dynamical properties are for all practical purposes very similar to what we obtain from the PIM but typical simulations can be more than 30 times faster. This has allowed us not only to expand our recent studies on the temperature and composition dependence of intermediate range order in MgCl2/KCl mixtures but also to access transport properties that were simply too costly to properly sample in our recently published studies.

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Effects of silicon carbide on the corrosion of metallic materials in molten LiF-NaF-KF salt

Cited by 15 publications

References 32 publications

Temperature Dependence of Short and Intermediate Range Order in Molten MgCl₂ and Its Mixture with KCl

Temperature Dependence of Short and Intermediate Range Order in Molten MgCl₂ and Its Mixture with KCl

Stress-assisted corrosion behaviour of Hastelloy N in FLiNaK molten salt environment

SEM-Drude Model for the Accurate and Efficient Simulation of MgCl₂–KCl Mixtures in the Condensed Phase

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Effects of silicon carbide on the corrosion of metallic materials in molten LiF-NaF-KF salt

Cited by 15 publications

References 32 publications

Temperature Dependence of Short and Intermediate Range Order in Molten MgCl2 and Its Mixture with KCl

Temperature Dependence of Short and Intermediate Range Order in Molten MgCl2 and Its Mixture with KCl

Stress-assisted corrosion behaviour of Hastelloy N in FLiNaK molten salt environment

SEM-Drude Model for the Accurate and Efficient Simulation of MgCl2–KCl Mixtures in the Condensed Phase

Contact Info

Product

Resources

About

Temperature Dependence of Short and Intermediate Range Order in Molten MgCl₂ and Its Mixture with KCl

Temperature Dependence of Short and Intermediate Range Order in Molten MgCl₂ and Its Mixture with KCl

SEM-Drude Model for the Accurate and Efficient Simulation of MgCl₂–KCl Mixtures in the Condensed Phase