Abstract
The effects of small additions of strontium on the oxidation behavior of aluminum–magnesium alloy melts were investigated by thermogravimetry at 750 °C for times up to 48 h. Oxidized samples were examined by FEGSEM, and phases formed within the oxide layer and in the alloy were identified by EDS, WDS and low-angle X-ray diffraction techniques. In the absence of Sr, the Al–Mg samples gained substantial amounts of weight by formation of spinel (MgAl2O4) at the oxide–metal interface. Samples containing Sr had significantly lower weight gains. A very significant decrease (98%) of total weight gain was observed for small Sr additions in the low Mg-bearing Al–Mg alloys. This change in oxidation behavior was linked to the presence of Sr enrichment of the liquid beneath the initial MgO layer suppressing the formation of spinel crystals.
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