Contribution of the oxygen reduction reaction to the electrochemical cathodic partial reaction for Mg-Al-Ca solid solutions

Felten M, Zhang S, Changizi R, Scheu C, Bruns M, Strebl M, Virtanen S, Zander D (2023)

Publication Type: Journal article

Publication year: 2023

Journal

Electrochemistry Communications Elsevier

Book Volume: 153

Article Number: 107529

DOI: 10.1016/j.elecom.2023.107529

Abstract

The electrochemical corrosion rate of magnesium depends on the stability of the surface layer formed. Based on the Mg substrate, the oxide structure comprises a dense MgO/Mg(OH)2 mixture underneath a porous plate-like Mg(OH)2 layer. While the kinetics of the anodic partial reaction have been mainly attributed to MgO, recent studies have showed an effect of the Mg(OH)2 layer thickness on the cathodic partial reaction. A thinner Mg(OH)2 layer has been associated with higher kinetics of the oxygen reduction reaction. In the present study, the mechanism has been further investigated via in situ respirometric measurements using Mg-Al-Ca solid solution in electrolytes with different pH values (pH = 8.0–13.0). The results indicate an additional effect based on the structure of the surface layer for Mg-Al-Ca alloys in the passive state. Furthermore, two different Al-enriched interfaces were observed and discussed in terms of their thermodynamic stability under alkaline immersion conditions.

Authors with CRIS profile

Mark Bruns Professur für Werkstoffwissenschaften (Korrosion und Oberflächentechnik) Michael Strebl Professur für Werkstoffwissenschaften (Korrosion und Oberflächentechnik) Sannakaisa Virtanen Professur für Werkstoffwissenschaften (Korrosion und Oberflächentechnik)

Involved external institutions

Rheinisch-Westfälische Technische Hochschule (RWTH) Aachen DE Germany (DE) Max-Planck-Institut für Eisenforschung GmbH (MPIE) / Max Planck Institute for Iron Research DE Germany (DE)

How to cite

APA:

Felten, M., Zhang, S., Changizi, R., Scheu, C., Bruns, M., Strebl, M.,... Zander, D. (2023). Contribution of the oxygen reduction reaction to the electrochemical cathodic partial reaction for Mg-Al-Ca solid solutions. Electrochemistry Communications, 153. https://doi.org/10.1016/j.elecom.2023.107529

MLA:

Felten, Markus, et al. "Contribution of the oxygen reduction reaction to the electrochemical cathodic partial reaction for Mg-Al-Ca solid solutions." Electrochemistry Communications 153 (2023).

BibTeX: Download