First steps toward predicting corrosion behavior of structural materials in molten salts

R. Pillai; S. S. Raiman; B. A. Pint

doi:10.1016/j.jnucmat.2020.152755

First steps toward predicting corrosion behavior of structural materials in molten salts

R. Pillai, S. S. Raiman, B. A. Pint

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25 Scopus citations

Abstract

To address the need for physics-based models to predict corrosion behavior of materials in molten salts, the current work proposes potential methods to aid in selection of optimum materials for structural components in molten salt powered technologies. In the present work, the role of alloy thermodynamics and kinetics on governing corrosion rates of Ni-based alloys will be discussed combining experimental and computational methods. A few strategies are presented to quantify corrosion rates of Ni-based materials isothermally exposed in purified KCl-MgCl₂ salts at 600 ^∘ C-800 ^∘ C. The influence of capsule material, potential corrosion products and role of alloy composition on the observed corrosion rates was discussed with coupled thermodynamic-kinetic models. Larger depths of corrosion attack were observed in alloy 230 specimens compared to other alloys under similar conditions was attributed to the much higher chemical activity of Cr in the alloy that results in a larger Cr chemical potential gradient.

Original language	English
Article number	152755
Journal	Journal of Nuclear Materials
Volume	546
DOIs	https://doi.org/10.1016/j.jnucmat.2020.152755
State	Published - Apr 1 2021

Funding

A. Willoughby, D. Sulemanovic and J. Kurley assisted with the experimental work at ORNL. T. Lowe, M. Romedenne and M. Lance are thanked for helping with microstructural characterization. J. McMurray and M. Romedenne are thanked for their valuable comments on the paper. This research was sponsored by the U.S. Department of Energy Office of Nuclear Energy, Molten Salt Reactor Campaign and the Nuclear Energy Advanced Modeling and Simulation program. This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ).

Funders	Funder number
Molten Salt Reactor Campaign
Nuclear Energy Advanced Modeling and Simulation program
US Department of Energy
U.S. Department of Energy
Office of Nuclear Energy
Oak Ridge National Laboratory

Keywords

Corrosion rates
Coupled thermodynamic-kinetic modeling
Molten salts
Ni-based alloys

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10.1016/j.jnucmat.2020.152755

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abstract = "To address the need for physics-based models to predict corrosion behavior of materials in molten salts, the current work proposes potential methods to aid in selection of optimum materials for structural components in molten salt powered technologies. In the present work, the role of alloy thermodynamics and kinetics on governing corrosion rates of Ni-based alloys will be discussed combining experimental and computational methods. A few strategies are presented to quantify corrosion rates of Ni-based materials isothermally exposed in purified KCl-MgCl2 salts at 600 ∘ C-800 ∘ C. The influence of capsule material, potential corrosion products and role of alloy composition on the observed corrosion rates was discussed with coupled thermodynamic-kinetic models. Larger depths of corrosion attack were observed in alloy 230 specimens compared to other alloys under similar conditions was attributed to the much higher chemical activity of Cr in the alloy that results in a larger Cr chemical potential gradient.",

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First steps toward predicting corrosion behavior of structural materials in molten salts

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Keywords

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