Investigating the oxidation behavior of Mg-Zn alloy: Effects of heating rates, gas flow, protective atmosphere, and alloy composition

Tuğçe Nur  SARAÇOĞLU; Safa   POLAT; Erkan  KOÇ; Muwafaq  MASHRAH; Amir  NAJAH SAUD; Marta  MICHALSKA-DOMAŃSKA

doi:10.55713/jmmm.v34i3.2033

Authors

Tuğçe Nur SARAÇOĞLU Biomedical Engineering, Karabuk University, Turkey
Safa POLAT Material Research and Development Laboratory, Karabuk University, Turkey; Metallurgy and Materials Engineering, Karabuk University, Turkey
Erkan KOÇ Biomedical Engineering, Karabuk University, Turkey
Muwafaq MASHRAH Material Research and Development Laboratory, Karabuk University, Turkey; Metallurgy and Materials Engineering, Karabuk University, Turkey
Amir NAJAH SAUD Biomedical Engineering, Karabuk University, Turkey; Biomedical Engineering, Al-Mustaqbal University College, Babylon, Iraq
Marta MICHALSKA-DOMAŃSKA Institute of Optoelectronics, Military University of Technology, 2 Kaliskiego Str., 00-908 Warsaw, Poland

DOI:

https://doi.org/10.55713/jmmm.v34i3.2033

Keywords:

Magnesium alloys, Mg-Zn alloy, Casting, DTA-Tg analysis, High temperature oxidation

Abstract

Magnesium-zinc alloys offer promising lightweight properties but are prone to oxidation during high-temperature processing and usage. In this study, the oxidation behavior of Mg-Zn alloy was examined according to the inert gas type flow rate, heating rate and alloy amount. Initially, alloys were produced by adding zinc at weight percentages of 0.5%, 1.5%, and 2% using the casting method. The alloys were characterized using X-ray fluorescence (XRF), X-ray Diffraction (XRD), and scanning electron microscope (SEM) analyses, revealing the formation of dendritic Mg-Zn intermetallic within the alloy. The oxidation behavior of these alloys was examined via differential thermal analysis (DTA) and thermogravimetric analysis (TGA), considering factors such as heating rate, gas flow rate, type of protective atmosphere, and amount of alloying element. The results indicated that the onset temperature of oxidation decreased with increasing heating rate. The effect of gas flow rate varied depending on the heating rate and the type of gas. Under a nitrogen atmosphere, conditions with a heating rate of 20°C∙min^‒1 and a gas flow rate of 5 cm³∙min^‒1 resulted in the least oxidation. In an argon atmosphere, a gas flow rate of 5 cm³∙min^‒1 was found to be sufficient to prevent oxidation. However, at a gas flow rate of 1 cm³∙min^‒1, a heating rate of 20°C∙min^‒1 was more effective in preventing oxidation. The alloying element (zinc) likely reduced oxidation, particularly at the 1.5% addition level, possibly due to the formation of intermetallic compounds.

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