Characterization of the Protective Surface Films Formed on Molten AZ91D Magnesium Alloy in SO2/Air Atmospheres in a Sealed Furnace

doi:10.1016/j.jmst.2013.10.026

J. Mater. Sci. Technol.

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Characterization of the Protective Surface Films Formed on Molten AZ91D Magnesium Alloy in SO₂/Air Atmospheres in a Sealed Furnace

Xianfei Wang^1,2), Shoumei Xiong^1,2)

1) Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
2) State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China

Received:2012-09-04 Revised:2012-10-10 Online:2014-04-15 Published:2014-04-22
Contact: S. Xiong
Supported by:
This work was supported by the Specialized Research Fund for the Doctoral Program of Higher Education under Grant No. 20090002110029, the High Technology Research and Development Program of China under Grant No. 2009AA03Z114 and the MOST (Ministry of Science and Technology) of China under Grant No. 2010DFA72760.

Abstract

Abstract:

Surface films that formed on molten AZ91D magnesium alloy in SO₂/air cover gases at 680 °C in a sealed furnace were characterized by scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction and Auger electron spectroscopy. It is revealed that the film formed on molten AZ91D alloy surface in cover gas with high air content can prevent the molten AZ91D alloy from oxidation and ignition. The surface film contained three elements, namely magnesium, oxygen and sulfur, and was mainly composed of MgO and MgS. The properties of the film depended on air content in the cover gas and holding time. Thermodynamic calculation showed that MgSO₄ was the stable phase, and it was concluded that the formation of MgSO₄ was important for the formation of the protective surface film in SO₂/air atmospheres.

Key words: Magnesium alloy, SO_2, Sealed furnace, Gas protection, Surface film

Xianfei Wang, Shoumei Xiong. Characterization of the Protective Surface Films Formed on Molten AZ91D Magnesium Alloy in SO₂/Air Atmospheres in a Sealed Furnace[J]. J. Mater. Sci. Technol., DOI: 10.1016/j.jmst.2013.10.026.

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Characterization of the Protective Surface Films Formed on Molten AZ91D Magnesium Alloy in SO₂/Air Atmospheres in a Sealed Furnace

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