In Situ Transmission Electron Microscopy of High-Temperature Inconel-625 Corrosion by Molten Chloride Salts

Pragnya, Prachi; Gall, Daniel; Hull, Robert

doi:10.1149/1945-7111/ac0225

In Situ Transmission Electron Microscopy of High-Temperature Inconel-625 Corrosion by Molten Chloride Salts

Journal Article · Sat May 01 04:00:00 EDT 2021 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1945-7111/ac0225· OSTI ID:1848767

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OSTI

This paper describes an approach to monitor high temperature molten chloride (MgCl₂-NaCl-KCl) salt corrosion of Inconel-625 alloy in real time at high spatial resolution. The approach is based on a micro-environmental-cell assembly integrated into a transmission-electron-microscope goniometer to examinein situthe salt-alloy interface during corrosion, employing real time electron diffraction and imaging. It establishes procedures to minimize incorporation of H₂O or O₂from atmosphere in the chloride salts during sample fabrication and corrosion, which is critical to understanding the fundamental corrosion mechanisms. A clustering algorithm and a 2D Gaussian fit function are used to determine diffraction spot intensities inin situdiffraction patterns, to quantify alloy corrosion. This facilitates quantitative observation of the evolution of individual grains, in contrast to conventional macroscopic corrosion rate quantification. The isothermal corrosion rate of Inconel-625 in an anhydrous, unoxidized salt-stack is 220 ± 30μm year^-1at 700 °C and 350 ± 20μm year^-1at 800 °C. However, the corrosion rate at 700 °C increases five-fold to 1000 ± 170μm year^-1when the salt stack is air-exposed, indicating the dominant effects of hydrated or oxidized impurities on corrosion acceleration. Real time imaging of the microstructure evolution suggests that corrosion is initiated at grain boundaries.

Research Organization:: Rensselaer Polytechnic Inst., Troy, NY (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

DOE Contract Number:: EE0008380

OSTI ID:: 1848767

Journal Information:: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 5 Vol. 168; ISSN 0013-4651

Publisher:: IOP Publishing - The Electrochemical Society

Country of Publication:: United States

Language:: English

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