Electrochemical corrosion behavior of 316L stainless steel in molten fluorides with a temperature gradient

Wang, Yanli; Wu, Jianxin; Wang, Changxuan; Zhang, Shenghua

doi:10.1016/j.elecom.2019.106612

Cited by 3 publications

(1 citation statement)

References 14 publications

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“…In fact, we believe it is probable that 1D wormhole corrosion is a common, yet hitherto largely unrecognized, type of corrosion mechanism in both molten salt environments and high-temperature corrosion reactions such as sulfidation-oxidation or flux that involves mass transport through liquids 14 . However, because of the lack of dry-polishing methods such as Ar + milling that preserve the salt-filled holes, the absence of 3D FIB-SEM tomography to reveal the internal percolation, and the complexity arising from intergranular precipitates in commercial alloys 26,[50][51][52][53][54] , this phenomenon was not realized until this current study.…”

Section: Resultsmentioning

confidence: 89%

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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Section: Resultsmentioning

confidence: 89%

One dimensional wormhole corrosion in metals

Yang

Zhou

et al. 2023

Nat Commun

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Microelectrode voltammetric analysis of samarium ions in LiCl–KCl eutectic molten salt

Yang

Lee

Jung

et al. 2023

Electrochemistry Communications

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Corrosion Behavior of Refractory High-Entropy Alloys in FLiNaK Molten Salts

Patel

Mahajan

Muskeri

et al. 2023

Metals

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Refractory high-entropy alloys (RHEAs) have recently attracted widespread attention due to their outstanding mechanical properties at elevated temperatures, making them appealing for concentrating solar power and nuclear energy applications. Here, the corrosion behavior of equimolar HfTaTiVZr and TaTiVWZr RHEAs was investigated in molten FLiNaK eutectic salt (LiF-NaF-KF: 46.5−11.5−42 mol.%) at 650 °C. Potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and immersion test measurements were carried out for these two RHEAs and compared with Inconel 718 (IN718) superalloy and SS316 stainless steel under identical test conditions. Both TaTiVWZr and HfTaTiVZr refractory high-entropy alloys exhibited an order of magnitude lower corrosion rate than SS316. IN718 and TaTiVWZr showed similar corrosion rates. Corrosion products enriched with noble alloying elements formed in the case of TaTiVWZr and IN718 were stable and protective on the substrate. SS316 showed the lowest corrosion resistance and void formation along the exposed surface due to the active dissolution of Cr and Fe, which provided diffusion paths for the corroded species. The surface analysis results showed that IN718 underwent pitting corrosion, while TaTiVWZr experienced selective dissolution in the inter-dendritic area. In contrast, HfTaTiVZr and SS316 experienced corrosion at the grain boundaries.

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Electrochemical corrosion behavior of 316L stainless steel in molten fluorides with a temperature gradient

Cited by 3 publications

References 14 publications

One dimensional wormhole corrosion in metals

One dimensional wormhole corrosion in metals

Microelectrode voltammetric analysis of samarium ions in LiCl–KCl eutectic molten salt

Corrosion Behavior of Refractory High-Entropy Alloys in FLiNaK Molten Salts

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