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PREPARATION OF PEO COATINGS ON AZ31 MAGNESIUM ALLOY IN THE PRESENCE OF HUMIC ACID

1 DOSKOČIL Leoš
Co-authors:
1 ŠOMANOVÁ Pavlína 1 WASSERBAUER Jaromír 1 KAJÁNEK Daniel 1 BUCHTÍK Martin
Institution:
1 Brno University of Technology, Faculty of Chemistry, Brno, Czech Republic, EU, doskocil@fch.vut.cz
Conference:
32nd International Conference on Metallurgy and Materials, Orea Congress Hotel Brno, Czech Republic, EU, May 17 - 19, 2023
Proceedings:
Proceedings 32nd International Conference on Metallurgy and Materials
Pages:
512-516
ISBN:
978-80-88365-12-9
ISSN:
2694-9296
DOI:
https://doi.org/10.37904/metal.2023.4713
Published:
8th January 2024
Proceedings of the conference were published in Web of Science.
Metrics:
226 views / 179 downloads
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Abstract

Magnesium materials are desirable for surface treatment because of their low corrosion resistance. The preparation of coatings on AZ31 alloy by plasma electrolytic oxidation (PEO) in a bath with and without humic acid was investigated. The coatings were characterized using a scanning electron microscope (SEM) with energy dispersive X-ray spectroscopy (EDS) and Fourier transform infrared spectroscopy (FTIR). The corrosion properties were tested using the potentiodynamic polarization method in 0.15 M NaCl. The results show that the PEO coatings had significantly higher corrosion resistance than the AZ31 alloy. The PEO coating prepared in the presence of 5 mg/l humic acid (10 min deposition) appeared to have slightly better corrosion resistance than the PEO coating prepared in the absence of humic acid.

Keywords: Magnesium alloys, humic acid, applications, 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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