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Measurement and removal of inclusions and hydrogen in magnesium

机译：测量和去除镁中的夹杂物和氢

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摘要

From many points of view magnesium is an interesting metal. It is abundant in nature and sources are in practice unlimited. For construction purposes magnesium is in many cases a very competitive material, especially in automotive applications where weight is critical. In order to fully exploit the great potential as a construction material, impurities present as either dissolved elements or inclusions must be monitored, controlled and -if necessary- removed. Also, magnesium is widely used as an alloying element in aluminium. For this reason some elements, especially hydrogen, are ill-favored. Oxides and hydrogen differ from other impurity elements, such as for instance Fe and Cu, in that they may be introduced in the melt as a result of metal handling and atmospheric exposure. Whilst most of the trace elements are precipitated and removed by flux-refining, oxide inclusions and hydrogen may require alternative refining processes. For instance, in the production of other metals e.g. aluminium inclusions are very often removed by filtration while hydrogen and other volatile elements are scavenged by gas purging. In this work, filtration and gas purging of magnesium have been studied. In order to evaluate the efficiency of a refining process we frequently have to take samples for subsequent analysis. For this purpose a filter sampler has been developed and tested. Molten metal is sucked through a sintered stainless steel sampling filter applying vacuum to a container behind the filter. A major part of the inclusions are retained inside and in front of the sampling filter. When the sampling container is full, the metal in the container and filter cup is allowed to solidify. The filter sample is detached from the filter cup and then cut in two, parallel to the flow direction, polished and later analyzed by light microscopy.

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