Adverse effect of 2,5PDC corrosion inhibitor on PEO coated magnesium

Vaghefinazari, B.; Wang, C.; Mercier, D.; Mei, D.; Seyeux, A.; Marcus, P.; Blawert, C.; Lamaka, S.V.; Zheludkevich, M.L.

Journalpaper

Adverse effect of 2,5PDC corrosion inhibitor on PEO coated magnesium

Abstract

Besides their noteworthy tribological and corrosion protection properties, Plasma Electrolytic Oxidation (PEO) coatings feature a porous microstructure that is able to host corrosion inhibitors. This study reveals that although 2,5pyridindicarboxylate (2,5PDC) shows a remarkable corrosion inhibition effect for bare AZ21 Mg alloy, it can extensively deteriorate a PEO coating on the same Mg substrate, resulting in an overall accelerated failure of the PEO-coated AZ21 alloy. The deteriorative behavior of 2,5PDC towards PEO-coated AZ21 is explained based on the characterization of the bare and PEO-coated AZ21 exposed to the NaCl electrolyte with and without inhibitor using EIS, SEM, STEM and ToF-SIMS.

DOI Link to Publication

URL: https://publications.hereon.de/id/40381/
Authors:Vaghefinazari, B., Wang, C., Mercier, D., Mei, D., Seyeux, A., Marcus, P., Blawert, C., Lamaka, S.V., Zheludkevich, M.L.
Year:2021
In: Corrosion Science
Volume:192
Pages:109830
Publisher:Elsevier, Orlando
Type:Journalpaper
ISSN: 0010-938X
Cite as: Vaghefinazari, B.; Wang, C.; Mercier, D.; Mei, D.; Seyeux, A.; Marcus, P.; Blawert, C.; Lamaka, S.V.; Zheludkevich, M.L.: Adverse effect of 2,5PDC corrosion inhibitor on PEO coated magnesium. In: Corrosion Science. Vol. 192 (2021) 109830. (DOI: /10.1016/j.corsci.2021.109830)