Effect of aluminum content and precipitation on the corrosion behavior and acoustic emission response of AZ31 and AZ80 magnesium alloys

0525521 - ÚJF 2021 RIV CZ eng C - Conference Paper (international conference)
Veverková, E. - Knapek, Michal - Minárik, P.
Effect of aluminum content and precipitation on the corrosion behavior and acoustic emission response of AZ31 and AZ80 magnesium alloys.
METAL 2019 - 28th International Conference on Metallurgy and Materials, Conference Proceedings. Ostrava: TANGER Ltd., 2019, s. 1732-1737. Roč. 1. ISBN 978-80-87294-92-5.
[Metal 2019 - 28th International Conference on Metallurgy and Materials. Brno (CZ), 22.05.2019-24.05.2019]
R&D Projects: GA MŠMT EF16_013/0001794
Institutional support: RVO:61389005
Keywords : Magnesium alloys * corrosion * acoustic emission * polarization
OECD category: Materials engineering

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 degrees 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.
Permanent Link: http://hdl.handle.net/11104/0309634