Determining oxidation states of transition metals in molten salt corrosion using electron energy loss spectroscopy. (May 2021)

• Record Type: Journal Article
• Authors: Bawane, Kaustubh; Manganaris, Panayotis; Wang, Yachun; Sure, Jagadeesh; Ronne, Arthur; Halstenberg, Phillip; Dai, Sheng; Gill, Simerjeet K.; Sasaki, Kotaro; Chen-Wiegart, Yu-chen Karen; Gakhar, Ruchi; Mahurin, Shannon; Pimblott, Simon M.; Wishart, James F.; He, Lingfeng
• Is Part Of: Scripta materialia. Number 197(2021)
• Publication Date: 2021-05
• Subjects: Molten salt corrosion -- Electron energy loss spectroscopy -- Oxidation state mapping -- Principal component analysis -- Multiple linear least squares fitting; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2021.113790
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: This work utilizes electron energy loss spectroscopy (EELS) to identify oxidation state of alloying elements in Ni-based alloys after exposure to molten chloride salt systems. Pure Ni and Ni-20Cr model alloy were corroded in molten ZnCl2 and KCl-MgCl2 under argon atmosphere at various temperatures. Oxidation states of Cr (Cr 3+ ) and Ni (Ni 2+ ) in the molten salt after corrosion were determined by monitoring changes in the L2, 3 edges of corresponding EELS spectra. Oxidation state mapping technique using principal component analysis and multiple linear least squares fitting in HyperSpy Python package was developed. Graphical Abstract: Image, graphical abstract