The mechanism of protection of molten magnesium by cover gas mixtures containing sulphur hexafluoride

Ricketts, N. J., Cashion, S. P. and Hayes, P. C. (2002) The mechanism of protection of molten magnesium by cover gas mixtures containing sulphur hexafluoride. Journal of Light Metals, 2 1: 43-47. doi:10.1016/S1471-5317(02)00012-3


Author Ricketts, N. J.
Cashion, S. P.
Hayes, P. C.
Title The mechanism of protection of molten magnesium by cover gas mixtures containing sulphur hexafluoride
Journal name Journal of Light Metals   Check publisher's open access policy
ISSN 1471-5317
Publication date 2002-02
Sub-type Article (original research)
DOI 10.1016/S1471-5317(02)00012-3
Volume 2
Issue 1
Start page 43
End page 47
Total pages 5
Place of publication London, United Kingdom
Publisher Elsevier Science Ltd
Collection year 2002
Language eng
Subject C1
291301 Process Metallurgy
670899 Other non-ferrous metals (e.g. copper, zinc)
091407 Pyrometallurgy
Abstract Experimental studies have been undertaken, involving in situ observations of the interaction between cover gas mixtures and molten magnesium. It has been shown that, in the presence of sulphur hexafluoride (SF6), the contact angle between solid MgO and molten magnesium is reduced, resulting in the wetting of MgO by magnesium metal. In contrast, it was observed that the absence of SF6 results in a large contact angle, poor wetting of the MgO by magnesium metal and a non-adherent surface film. It is proposed that the formation of an adherent, protective surface film under a cover gas mixture containing SF6 is due to capillary forces acting within the film.
Keyword Melt protection
Sulphur hexafluoride
Contact angle
Wetting
Surface tension
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Chemical Engineering Publications
 
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Created: Tue, 14 Aug 2007, 18:01:35 EST