In-situ TEM shows acceleration of corrosion at high temperature in Inconel alloy

Recently, the researchers from Rensselaer Polytechnic Institute (RPI) studied the mechanism of corrosion in nickel-based Inconel-625 alloy using high-temperature molten chloride (MgCl2-NaCl-KCl). The study performed using Hummingbird Scientific’s Gas Cell TEM holder system demonstrates the initiation and acceleration of corrosion in the inter-granular region of the alloy film when exposed to air or moisture. The work is published in the Journal of The Electrochemical Society.

In-situ TEM heating of Inconel thin film (50 nm) in the molten salt stack under 1 bar of N2 gas condition and heated from 700°C to 900°C. Upon heating, the corrosion nucleates and accelerates growing laterally to the adjacent grains. Image Credit: © Copyright 2021 IOP Publishing.

The work presented here using the Gas Cell TEM holder presents a unique methodology to perform control monitoring of high-temperature corrosion processes in the ambient condition without introducing significant H2O and N2 into the sample chamber.

Reference: Prachi Pragnya, Daniel Gall, and Robert Hull. “In Situ Transmission Electron Microscopy of High-Temperature Inconel-625 Corrosion by Molten Chloride Salts,” Journal of The Electrochemical Society (2021). Full Paper

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