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Refining anodic and cathodic dissolution mechanisms of the multi-principal element alloys using atomic emission spectroelectrochemistry coupled with electrochemical impedance spectroscopy
Junsoo Han
* 1 ,
Pin Lu
2 ,
James E. Saal
3 ,
Gerald S. Frankel
4 ,
Kevin Ogle
5 ,
John R. Scully
6
1  Department of Materials Science and Engineering, University of Virginia, Charlottesville, VA, 22904, USA; Chimie ParisTech, PSL Research University, CNRS, Institut de Recherche Chimie Paris (IRCP), F-75005 Paris, France
2  QuesTek Innovations LLC, Evanston, IL, 60201, USA
3  Citrine Informatics, Redwood City, CA, 94063, USA
4  Fontana Corrosion Center, The Ohio State University, Columbus, OH, 43210, USA
5  Chimie ParisTech, PSL Research University, CNRS, Institut de Recherche Chimie Paris (IRCP), F-75005 Paris, France
6  Department of Materials Science and Engineering, University of Virginia, Charlottesville, VA, 22904, USA
Published: 07 May 2021 by MDPI in 1st Corrosion and Materials Degradation Web Conference session Corrosion and Passivation of Compositionally Complex and High Entropy Alloys
https://doi.org/10.3390/CMDWC2021-09920
Abstract:

The elementally resolved dissolution kinetics of a Ni-Fe-Cr-Mn-Co multi-principal element alloy (MPEA) was investigated by in-situ atomic emission spectroelectrochemistry (AESEC) coupled to electrochemical impedance spectroscopy (EIS). Potentiostatic AESEC-EIS experiments were conducted at open circuit potential and a passive potential in 2 M H2SO4 solution. Elemental Lissajous plot enabled to determine the elemental Tafel slopes of each alloying element suggesting that the different elemental oxidation rate would lead to a duplex oxide formation during passivation. Elementally resolved dissolution rates in spontaneous dissolution (elemental corrosion rates) were estimated by Stern-Geary equation with elemental Tafel slopes and polarization resistance obtained from EIS.

Acknowledgement: The research was primarily supported as part of the Center for Performance and Design of Nuclear Waste Forms and Containers (WastePD), an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, under award #DE-SC0016584. K. Ogle and the AESEC experiments were supported by the Agence Nationale de Recherche, grant # ANR-20-CE08-0031 (Tapas 2020).

Keywords: multi-principal element alloy; AESEC; EIS; passivation; corrosion
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