USE OF SO2/AIR/N2 COVER GASES FOR THE PROTECTION ON MOLTEN MAGNESIUM AND AZ91D ALLOY

doi:10.3724/SP.J.1037.2013.00386

Acta Metall Sin

2014, Vol. 50

Issue (1): 32-40 DOI: 10.3724/SP.J.1037.2013.00386

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USE OF SO₂/AIR/N₂ COVER GASES FOR THE PROTECTION ON MOLTEN MAGNESIUM AND AZ91D ALLOY

WANG Xianfei, XIONG Shoumei(

)

State Key Laboratory of Automotive Safety and Energy, School of Materials Science and Engineering, Tsinghua University, Beijing 100084

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WANG Xianfei, XIONG Shoumei. USE OF SO₂/AIR/N₂ COVER GASES FOR THE PROTECTION ON MOLTEN MAGNESIUM AND AZ91D ALLOY. Acta Metall Sin, 2014, 50(1): 32-40.

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Abstract

Molten magnesium and AZ91D alloy oxidize rapidly during casting process, sulfur dioxide (SO₂) mixed with carrier gases can be used to protect the melt by reacting with the melt to form a coherent protective film on the melt surface. In this work, the films formed in SO₂/Air/N₂ cover gases were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Auger electron spectroscopy (AES) and X-ray photoelectron spectroscopy (XPS), the formation process and the protective mechanism of the surface film were also discussed. The results show that the protective film is composed of MgO, MgS and MgSO₄. MgS increases the pilling and bedworth ratio of the surface film and enhances its protective capability. MgSO₄ is the thermodynamically stable phase and its formation is important for the formation of protective film. When SO₂/Air/N₂ cover gases are used to protect the melt and SO₂ content is fixed, air content should be controlled within a certain range.

Key words: magnesium magnesium alloy gas protection SO₂ surface film

Received: 08 July 2013

ZTFLH:

TG146.2

Fund: Supported by National Natural Science Foundation of China (No.51275269), National Key Technologies R&D Program (No.2011BAE22B02) and International S&T Cooperation Program of China (No.2010DFA72760)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00386 OR https://www.ams.org.cn/EN/Y2014/V50/I1/32

Fig.1

AZ91D和纯Mg在密封条件下保温后的宏观表面形貌

Fig.2

AZ91D在密封条件下的表面膜SEM像

Fig.3

纯Mg在密封条件下的表面膜截面SEM像

Fig.4

纯Mg在密封条件下的表面膜的各元素含量随溅射时间(样品深度)的变化曲线

Fig.5

AZ91D在开放条件下的表面膜的各元素含量随溅射时间(样品深度)的变化曲线

Fig.6

纯Mg在开放条件下的表面膜的各元素含量随溅射时间(样品深度)的变化曲线和截面形貌

Fig.7

表面膜表层及溅射约50 nm深度处的元素XPS谱

Fig.8

添加有实际气氛状态点的680 ℃下的Mg-O-S二维平衡状态图^[16]

Fig.9

AZ91D在700 ℃下不同气氛中的氧化增重曲线

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