EFFECT OF ALUMINUM CONTENT AND PRECIPITATION ON THE CORROSION BEHAVIOR AND ACOUSTIC EMISSION RESPONSE OF AZ31 AND AZ80 MAGNESIUM ALLOYS

1 Veverková Eliška
Co-authors:
1,2 KNAPEK Michal 1 MINÁRIK Peter
Institutions:
1 Charles University, Department of Physics of Materials, Prague, Czech Republic, EU, ve.eliska@gmail.com, knapek@karlov.mff.cuni.cz, peter.minarik@mff.cuni.cz
2 The Czech Academy of Sciences, Nuclear Physics Institute, Řež 130, 250 68 Řež, Czech Republic, EU
Conference:
28th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 22nd - 24th 2019
Proceedings:
Proceedings 28th International Conference on Metallurgy and Materials
Pages:
1732-1737
ISBN:
978-80-87294-92-5
ISSN:
2694-9296
Published:
4th November 2019
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
32 views / 11 downloads
Abstract

In this study, we investigated the effect of aluminum content and precipitation on the corrosion behavior of the AZ31 and AZ80 magnesium alloys. The investigated alloys were received in the as-extruded condition in order to retain comparable grain size and texture. First, solid solution treatment was performed on the samples of both alloys. Subsequently, the samples were isothermally aged at 200 °C for 20 hours. The scanning electron microscopy was used to study the grain size and microstructure. The corrosion properties of samples were studied by potentiodynamic polarization measurements and the AE signal was concurrently recorded. Solution treated AZ80 and AZ31 samples exhibited similar behavior. The aged AZ80 sample showed lower corrosion rate. Also, a strong breakdown appeared in the later (compared to other samples) stage of the potentiodynamic test. The breakdown was found to be easily recognized by AE parameters.

Keywords: Magnesium alloys, corrosion, acoustic emission, polarization
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