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Preparation of Anhydrous Magnesium Chloride from MgCl2·6H2O Ⅱ Thermal Decomposition Mechanism of the Intermediate Product
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Metal Quality - From Ingot to Finished Product
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A New Low GWP Protective Atmosphere Containing HFC-152a for Molten Magnesium against Ignition
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A Novel Technique for On-Line Generation of Mg-Shielding Gas
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High Precision Multiple Gas Mix & Distribution System for Mg-Alloy Smelting Protection Gas
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On Specific Features of Operating Crucibleless Salt-Bath Furnaces
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A New Low GWP Protective Atmosphere Containing HFC-152a for Molten Magnesium against Ignition

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Abstract:

Sulphur hexafluoride (SF6) is widely used by the magnesium industry as a protective atmosphere. It has been demonstrated that SF6 prevents molten magnesium from further oxidation by reacting with magnesium to make the surface film on the magnesium melt denser. However, due to its high greenhouse effect (GWP=23900), the alternatives of SF6 must be sought. In this paper, 1,1-difluoroethane (commercially named HFC-152a), whose GWP value is only 140 and far lower than that of SF6, was tested to check its capacity of ignition-proof and further-oxidation-proof. Similar to SF6, the melt’s surface film formed in the protective atmosphere containing HFC-152a has a shiny metallic appearance. The surface film’s microstructure has been characterized with X-ray diffraction (XRD) and scanning electron microscopy (SEM). XRD’s results showed that the film contains only MgO and MgF2 phases while SEM showed their morphologies are uniform.

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Periodical:

Materials Science Forum (Volumes 488-489)

Pages:

73-76

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.488-489.73

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Online since:

July 2005

Authors:

Yi-wen Zeng, Li Ming Peng, Xie Min Mao, Xiao Qin Zeng, Wen Jiang Ding

Keywords:

HFC-152a, Protective Atmosphere, SF6

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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