Corrosion of Metallic Materials in the Molten FLiNaK

Polovov, Ilya B.; Abramov, A. V.; Alimgulov, Ruslan R.; Trubcheninova, Anastasiya I.; Gibadullina, Alfiya F.; Volkovich, Vladimir A.; Zhilyakov, A. Yu.; Хотинов, В. А.; Беликов, С.

doi:10.1149/09810.0453ecst

Cited by 3 publications

(1 citation statement)

References 11 publications

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“…During the reductive extraction step, the construction materials contact both liquid Bi-Li alloy and molten fluoride salt, and the choice of objects for the present study reflects this circumstance. Previously [20], we showed that molybdenum and nickel super alloys have high corrosion stability in fluoride melts; therefore, these metals were now selected for assessing their corrosion behavior in a Bi-Li alloy.…”

Section: Introductionmentioning

confidence: 99%

Corrosion of Metals and Nickel-Based Alloys in Liquid Bismuth–Lithium Alloy

Abramov

Alimgulov

Trubcheninova

et al. 2021

Metals

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Bismuth–lithium alloys are considered as primary candidates for the reductive extraction step of on-line reprocessing of a molten salt reactor fuel. The corrosion behavior of pure metals and nickel-based alloys was studied in a liquid Bi–Li (5 mol.%) alloy at 650 °C. The tantalum, molybdenum, and corrosion-resistant alloys VDM® Alloy C-4, Hastelloy® G-35®, KhN62M, VDM® Alloy 59 were studied as prospective materials for this liquid metal media. The corrosion rates were determined by gravimetric method as well as chemical analysis of corrosion products in Bi–Li alloy. Microstructure and chemical composition of samples of the materials and Bi–Li alloys containing the corrosion products after the tests were evaluated using inductively coupled plasma–atomic emission spectroscopy, X-ray fluorescence analysis, scanning electron microscopy, and energy dispersive spectroscopy. Metallic tantalum and molybdenum do not chemically interact with liquid Bi–Li alloy; the corrosion rate of these metals is determined only by the solubility in this medium. The corrosion rates of Ta and Mo at 650 °C were 0.09 and 0.07 mm/year, respectively. Nickel alloys are subjected to severe corrosion in liquid Bi–Li alloys due to dissolution of nickel in liquid bismuth. Alloys of this type cannot be used in such an environment.

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Section: Introductionmentioning

confidence: 99%

Corrosion of Metals and Nickel-Based Alloys in Liquid Bismuth–Lithium Alloy

Abramov

Alimgulov

Trubcheninova

et al. 2021

Metals

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One dimensional wormhole corrosion in metals

Yang

Zhou

et al. 2023

Nat Commun

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Corrosion is a ubiquitous failure mode of materials. Often, the progression of localized corrosion is accompanied by the evolution of porosity in materials previously reported to be either three-dimensional or two-dimensional. However, using new tools and analysis techniques, we have realized that a more localized form of corrosion, which we call 1D wormhole corrosion, has previously been miscategorized in some situations. Using electron tomography, we show multiple examples of this 1D and percolating morphology. To understand the origin of this mechanism in a Ni-Cr alloy corroded by molten salt, we combined energy-filtered four-dimensional scanning transmission electron microscopy and ab initio density functional theory calculations to develop a vacancy mapping method with nanometer-resolution, identifying a remarkably high vacancy concentration in the diffusion-induced grain boundary migration zone, up to 100 times the equilibrium value at the melting point. Deciphering the origins of 1D corrosion is an important step towards designing structural materials with enhanced corrosion resistance.

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From Pairwise Comparisons of Complex Behavior to an Overall Performance Rank: A Novel Alloy Design Strategy

Herschberg,

Rateau,

Martinelli

et al. 2024

Metals

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A method is developed to exploit data on complex materials behaviors that are impossible to tackle by conventional machine learning tools. A pairwise comparison algorithm is used to assess a particular property among a group of different alloys tested simultaneously in identical conditions. Even though such characteristics can be evaluated differently across teams, if a series of the same alloys are analyzed among two or more studies, it is feasible to infer an overall ranking among materials. The obtained ranking is later fitted with respect to the alloy’s composition by a Gaussian process. The predictive power of the method is demonstrated in the case of the resistance of metallic materials to molten salt corrosion and wear. In this case, the method is applied to the design of wear-resistant hard-facing alloys by also associating it with a combinatorial optimization of their composition by a multi-objective genetic algorithm. New alloys are selected and fabricated, and their experimental behavior is compared to that of concurrent materials. This generic method can therefore be applied to model other complex material properties—such as environmental resistance, contact properties, or processability—and to design alloys with improved performance.

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Corrosion of Metallic Materials in the Molten FLiNaK

Cited by 3 publications

References 11 publications

Corrosion of Metals and Nickel-Based Alloys in Liquid Bismuth–Lithium Alloy

Corrosion of Metals and Nickel-Based Alloys in Liquid Bismuth–Lithium Alloy

One dimensional wormhole corrosion in metals

From Pairwise Comparisons of Complex Behavior to an Overall Performance Rank: A Novel Alloy Design Strategy

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