Origins of anomalous output of magnesium sensor

Authors: Fergus, J. W.; Hui, S.; Gale, W. F.; Abdo, Z. A. M.

Source: Materials Science and Technology, Volume 13, Number 6, June 1997 , pp. 533-536(4)

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Abstract:

Previous tests of a magnesium sensor based on a magnesium fluoride solid electrolyte in molten aluminium-magnesium-silicon alloys indicated that the sensor output was affected by silicon contents of 3.5 wt-% or greater. This effect was previously attributed to the formation of Mg₂Si. The subsequent work described in this communication indicates that the silicon affects the sensor output by increasing the loss of magnesium as a result of preferential vaporisation or oxidation, probably by reducing the protection provided by the oxide layer formed on the surface of the alloy.

Document Type: Short Communication

DOI: http://dx.doi.org/10.1179/026708397790302034

Publication date: 1997-06-01

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