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MICROSTRUCTURE AND ELECTROCHEMICAL CORROSION BEHAVIOR OF CAP/PEO DUPLEX COATING ON AZ31 MAGNESIUM ALLOY

1 BRESCHER Roman
Co-authors:
1 BUCHTÍK Martin 1 HASOŇOVÁ Michaela 1 BŘEZINA Matěj 2 KAJÁNEK Daniel 1 WASSERBAUER Jaromír 1 DOSKOČIL Leoš
Institutions:
1 FCH VUT – Brno University of Technology, Faculty of Chemistry, Brno, Czech Republic, EU, Roman.Brescher@vut.cz, xcbuchtik@fch.vut.cz, hasonova@fch.vut.cz, brezina@fch.vut.cz, wasserbauer@fch.vut.cz, doskocil@fch.vut.cz
2 Research Centre of the University of Žilina, University of Žilina, Žilina, Slovak Republic, EU, daniel.kajanek@uniza.sk
Conference:
31st International Conference on Metallurgy and Materials, Orea Congress Hotel Brno, Czech Republic, EU, May 18 - 19, 2022
Proceedings:
Proceedings 31st International Conference on Metallurgy and Materials
Pages:
500-505
ISBN:
978-80-88365-06-8
ISSN:
2694-9296
DOI:
https://doi.org/10.37904/metal.2022.4483
Published:
30th June 2022
Proceedings of the conference have already been published in Scopus and we are waiting for evaluation and potential indexing in Web of Science.
Metrics:
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Abstract

Plasma electrolytic oxidation (PEO) coatings with and without calcium phosphate (CaP) were prepared on AZ31 magnesium alloy including the CaP coating on AZ31 alloy. The microstructure of all coatings was characterized using an electron scanning microscope with energy dispersive spectroscopy (SEM/EDS). The PEO coating revealed the presence of many pores and microcracks on its surface. The deposition of CaP on the PEO layer led to the cover of these microstructural defects. Potentiodynamic polarization in 0.15 M NaCl medium showed that CaP/PEO, CaP and PEO coatings led to the improvement in the corrosion resistance when compared to bare AZ31 alloy. However, the corrosion resistance of CaP/PEO duplex coating was lower than PEO coating even though the CaP crystals covered the pores and microstructural defects.

Keywords: Plasma electrolytic oxidation, AZ31 alloy, calcium phosphate, coating, corrosion

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