CHARACTERIZATION OF THE SURFACE FILM FORMED ON MOLTEN AZ91D MAGNESIUM ALLOY PROTECTED BY SO2 MIXTURES

doi:10.3724/SP.J.1037.2010.00303

Acta Metall Sin

2010, Vol. 46

Issue (12): 1529-1533 DOI: 10.3724/SP.J.1037.2010.00303

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CHARACTERIZATION OF THE SURFACE FILM FORMED ON MOLTEN AZ91D MAGNESIUM ALLOY PROTECTED BY SO₂ MIXTURES

WANG Xianfei, XIONG Shoumei

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

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WANG Xianfei XIONG Shoumei. CHARACTERIZATION OF THE SURFACE FILM FORMED ON MOLTEN AZ91D MAGNESIUM ALLOY PROTECTED BY SO₂ MIXTURES. Acta Metall Sin, 2010, 46(12): 1529-1533.

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Abstract Molten magnesium alloy oxidizes rapidly during casting and handling processes, sulfur dioxide (SO₂ ) mixed with carrier gases can be used to protect molten magnesium alloy by reacting with the melt to form a coherent protective film on the melt surface. In this paper, the films formed in controlled atmospheres with SO₂ gas were characterized by X–ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and Auger electron spectroscopy (AES), the formation process and the protective mechanism of the surface film were also discussed. The results show that the film is a network structure with similar microstructure characteristics and composition in the boundary area and the interior area. AES depth profiling and SEM observation both indicate that the film thickness is to be in a range of 0.5—3.0 μm, and the film is composed of two layers with an outer layer of MgO and a composite layer of MgO and MgS beneath the outer layer. MgS increases the pilling and bedworth ratio of the surface film and enhances its protective capability.

Key words: magnesium alloy gas protection SO₂ surface film

Received: 28 June 2010

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Supported by Specialized Research Fund for the Doctoral Program of Higher Education (No.20090002110029) and High Technology Research and Development Program of China (No.2009AA03Z114)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2010.00303 OR https://www.ams.org.cn/EN/Y2010/V46/I12/1529

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