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EFFECT OF SURFACE PRETREATMENT ON THE FORMATION AND PROTECTIVENESS OF PEO LAYERS ON PURE MAGNESIUM AND WE43 ALLOY

1,2 MINÁRIK Peter
Co-authors:
2 KAJÁNEK Daniel 1 VERTAĽ Jakub 3 KUBÁSEK Jiří
Institutions:
1 Charles University, Department of Physics of Materials, Ke Karlovu 5, 12116 Prague, Czech Republic, EU, peter.minarik@matfyz.cuni.cz; kubovertal@gmail.com
2 University of Žilina, Research Centre, Univerzitná 8215/1, Žilina 01026, Slovakia, EU, daniel.kajanek@uniza.sk
3 University of Chemistry and Technology, Department of Metals and Corrosion Engineering, Technická 5, 166 28 Prague, Czech Republic, EU, jiri.kubasek@vscht.cz
Conference:
34th International Conference on Metallurgy and Materials, Orea Congress Hotel Brno, Czech Republic, EU, May 21 - 23, 2025
Proceedings:
Proceedings 34th International Conference on Metallurgy and Materials
ISBN:
978-80-88365-27-3
ISSN:
2694-9296
Licence:
CC BY 4.0
Metrics:
20 views / 19 downloads
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Abstract

Plasma electrolytic oxidation (PEO) has emerged as a promising surface modification technique to enhance corrosion resistance of magnesium alloys. This study investigates the influence of different surface pretreatments: polishing, grinding, and shot-peening, on the formation and performance of PEO coatings on pure magnesium and WE43 (Mg-4Y-3RE) alloy. SEM analysis was used to characterise the coating morphology, while electrochemical impedance spectroscopy was employed to monitor corrosion behaviour over 168-hour period. The results reveal that PEO significantly improves corrosion resistance in both materials, with polished samples exhibiting the highest initial polarisation resistance. Interestingly, shot-peening had a detrimental effect on corrosion resistance in pure magnesium after longer immersion period but resulted in improved performance for WE43, attributed to the beneficial interaction between deformation-induced lattice defects and rare earth elements. These findings highlight the complex relationship between alloy composition, surface preparation, and corrosion behaviour.

Keywords: Magnesium; plasma electrode oxidation, surface treatment; corrosion

© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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