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Electrochemical Impedance Spectroscopy for the Measurement of the Corrosion Rate of Magnesium Alloys: Brief Review and Challenges

PEO of AZ31 Mg Alloy: Effect of Electrolyte Phosphate Content and Current Density

Research Centre of the University of Žilina, University of Žilina, Univerzitná 8215/1, 01026 Žilina, Slovakia
Institute of Physics of Materials, Czech Academy of Sciences, Žižkova 513/22, 61600 Brno, Czech Republic
Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Purkyňova 464/118, 61200 Brno, Czech Republic
Department of Metallurgy and Materials Engineering, University of Malta, Msida, MSD 2080, Malta
Author to whom correspondence should be addressed.
Metals 2020, 10(11), 1521;
Received: 26 October 2020 / Revised: 13 November 2020 / Accepted: 14 November 2020 / Published: 17 November 2020
(This article belongs to the Special Issue Surface Chemistry and Corrosion of Light Alloys)
In this work, the quality of coatings prepared by plasma electrolytic oxidation (PEO) on an AZ31 magnesium alloy were evaluated. This was done by studying the effects of the chemical composition of phosphate-based process electrolytes in combination with different applied current densities on coating thickness, porosity, micro-cracking and corrosion resistance in 0.1 M NaCl. Both processing parameters were studied in four different levels. Mid-term corrosion resistance in 0.1 M NaCl was examined by electrochemical impedance spectroscopy and based on this, corrosion mechanisms were hypothesized. Results of performed experiments showed that the chosen processing parameters and electrolyte composition significantly influenced the morphology and corrosion performance of the prepared PEO coatings. The PEO coating prepared in an electrolyte with 12 g/L Na3PO4·12H2O and using an applied current density 0.05 A/cm2 reached the highest value of polarization resistance. This was more than 11 times higher when compared to the uncoated counterpart. View Full-Text
Keywords: magnesium alloy; plasma electrolytic oxidation; corrosion magnesium alloy; plasma electrolytic oxidation; corrosion
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MDPI and ACS Style

Hadzima, B.; Kajánek, D.; Jambor, M.; Drábiková, J.; Březina, M.; Buhagiar, J.; Pastorková, J.; Jacková, M. PEO of AZ31 Mg Alloy: Effect of Electrolyte Phosphate Content and Current Density. Metals 2020, 10, 1521.

AMA Style

Hadzima B, Kajánek D, Jambor M, Drábiková J, Březina M, Buhagiar J, Pastorková J, Jacková M. PEO of AZ31 Mg Alloy: Effect of Electrolyte Phosphate Content and Current Density. Metals. 2020; 10(11):1521.

Chicago/Turabian Style

Hadzima, Branislav, Daniel Kajánek, Michal Jambor, Juliána Drábiková, Matěj Březina, Joseph Buhagiar, Jana Pastorková, and Martina Jacková. 2020. "PEO of AZ31 Mg Alloy: Effect of Electrolyte Phosphate Content and Current Density" Metals 10, no. 11: 1521.

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