Abstract
One of the major issues for users and potential users of magnesium is magnesium melt protection. This is particularly so with the use of sulphur hexafluoride coming under increased scrutiny, as it is now recognised as a very potent greenhouse gas. It has been demonstrated that sulphur hexafluoride prevents molten magnesium from oxidation by adding fluorine into the unprotective magnesium oxide surface film. The hydrofluorocarbon gas 1,1,1,2-tetrafluoroethane (HFC-13a) has been recently developed for magnesium melt protection by the Cooperative Research Centre for Cast Metals Manufacturing (CAST) in Australia. This gas has a global warming potential 18 times lower than sulphur hexafluoride and has been shown to be an effective replacement for SF in many applications. HFC-134a has also been shown to have some unique properties resulting in more possible applications for magnesium melt protection than sulphur hexafluoride. Recent experience with HFC-134a in laboratory and plant trials is discussed as well as the global implications of replacing sulphur hexafluoride with hydrofluorocarbons.
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