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Volume 18
Issue 17
10.3390/ma18174064
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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

PEO Treatment for Improved Corrosion Resistance in a Zn-Mg Alloy: Electrochemical and Structural Analysis

by
Ramona Cimpoeșu
1,
Sorin Georgian Moga
2,
Bogdan Istrate
3,
Fabian Cezar Lupu
3,
Nicanor Cimpoesu
1,
Ana-Maria Roman
1,
Gheorghe Bădărău
1,
Ion Pătrașcu
4,
Remus Diaconu
4 and
Romeu Chelariu
1,*
1
Department of Materials Science, Faculty of Materials Science and Engineering, “Gheorghe Asachi” Technical University of Iasi, 41 Dimitrie Mangeron Blvd., 700050 Iasi, Romania
2
Regional Center of Research and Development for Materials, Processes, and Innovative Products Dedicated to the Automotive Industry, National University of Science and Technology Politehnica Bucharest, Pitesti University Centre, Targu din Vale, No. 1, 110040 Pitesti, Romania
3
Faculty of Mechanical Engineering, “Gheorghe Asachi” Technical University of Iasi, 43 Dimitrie Mangeron Blvd., 700050 Iasi, Romania
4
SC iP AUTOMATIC DESIGN SRL, 6 Industriei Str., 117435 Lunca Corbului, Romania
*
Author to whom correspondence should be addressed.
Materials 2025, 18(17), 4064; https://doi.org/10.3390/ma18174064
Submission received: 23 July 2025 / Revised: 26 August 2025 / Accepted: 28 August 2025 / Published: 29 August 2025
(This article belongs to the Special Issue Next-Generation Alloys: Nanostructured Metals, Complex Steels, and Multi-Component Systems)
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Abstract

Zinc-based alloys have been extensively studied for their potential applications in biodegradable materials, yet their corrosion behaviour necessitates the development of effective surface treatments. In this study, a ZnMg alloy was developed by casting in an inert medium and subsequently treating it with Plasma Electrolytic Oxidation (PEO). The corrosion behaviour was characterised in a 0.9% NaCl solution through Tafel polarisation, cyclic polarisation, and electrochemical impedance spectroscopy (EIS). Additionally, the surface morphology was investigated using scanning electron microscopy (SEM) and EDX analysis. The structure and phases of the oxide layer and of the corrosion products were investigated through X-ray diffraction (XRD). The electrochemical results demonstrated a substantial decrease in the corrosion current density and an increase in the polarisation resistance for the treated samples. Electrical Impedance Spectroscopy (EIS) modelling revealed the formation of a layer exhibiting distinct capacitive behaviour, comprising two distinct regions. XRD analysis confirmed evidence of corrosion compounds characteristic of chlorinated media on the surface. The findings indicated that PEO treatment enhanced the corrosion resistance of the ZnMg alloy, suggesting its suitability for biomedical applications or exposure to marine environments characterised by high levels of corrosion.
Keywords: ZnMg alloy; plasma electrolytic oxidation; corrosion resistance ZnMg alloy; plasma electrolytic oxidation; corrosion resistance
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MDPI and ACS Style

Cimpoeșu, R.; Moga, S.G.; Istrate, B.; Lupu, F.C.; Cimpoesu, N.; Roman, A.-M.; Bădărău, G.; Pătrașcu, I.; Diaconu, R.; Chelariu, R. PEO Treatment for Improved Corrosion Resistance in a Zn-Mg Alloy: Electrochemical and Structural Analysis. Materials 2025, 18, 4064. https://doi.org/10.3390/ma18174064

AMA Style

Cimpoeșu R, Moga SG, Istrate B, Lupu FC, Cimpoesu N, Roman A-M, Bădărău G, Pătrașcu I, Diaconu R, Chelariu R. PEO Treatment for Improved Corrosion Resistance in a Zn-Mg Alloy: Electrochemical and Structural Analysis. Materials. 2025; 18(17):4064. https://doi.org/10.3390/ma18174064

Chicago/Turabian Style

Cimpoeșu, Ramona, Sorin Georgian Moga, Bogdan Istrate, Fabian Cezar Lupu, Nicanor Cimpoesu, Ana-Maria Roman, Gheorghe Bădărău, Ion Pătrașcu, Remus Diaconu, and Romeu Chelariu. 2025. "PEO Treatment for Improved Corrosion Resistance in a Zn-Mg Alloy: Electrochemical and Structural Analysis" Materials 18, no. 17: 4064. https://doi.org/10.3390/ma18174064

APA Style

Cimpoeșu, R., Moga, S. G., Istrate, B., Lupu, F. C., Cimpoesu, N., Roman, A.-M., Bădărău, G., Pătrașcu, I., Diaconu, R., & Chelariu, R. (2025). PEO Treatment for Improved Corrosion Resistance in a Zn-Mg Alloy: Electrochemical and Structural Analysis. Materials, 18(17), 4064. https://doi.org/10.3390/ma18174064

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