Events 1st Corrosion and Materials Degradation Web Conference

Event submissions

Published

10.3390/CMDWC2021-09920

This submission belongs to the session S14. Corrosion and Passivation of Compositionally Complex and High Entropy Alloys of the event 1st Corrosion and Materials Degradation Web Conference

Published date

07 May, 2021

Citation

Junsoo Han, Pin Lu, James E. Saal, Gerald S. Frankel, Kevin Ogle, John R. Scully, Refining anodic and cathodic dissolution mechanisms of the multi-principal element alloys using atomic emission spectroelectrochemistry coupled with electrochemical impedance spectroscopy, in Proceedings of 1st Corrosion and Materials Degradation Web Conference, 17 May–19 May 2021, MDPI: Basel, Switzerland, doi: 10.3390/CMDWC2021-09920

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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, China

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

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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Corrosion and passivation of multi-principal element alloys in aqueous solutions