Effect of Low-Levels of Strontium on the Oxidation Behavior of Selected Molten Aluminum–Magnesium Alloys

Autor:	J. E. Gruzleski, Robin A. L. Drew, O. Ozdemir
Rok vydání:	2009
Předmět:	Strontium Materials science Magnesium Inorganic chemistry Alloy Spinel Metals and Alloys Oxide chemistry.chemical_element engineering.material Corrosion Inorganic Chemistry Thermogravimetry chemistry.chemical_compound chemistry Aluminium Materials Chemistry engineering
Zdroj:	Oxidation of Metals. 72:241-257
ISSN:	1573-4889 0030-770X
DOI:	10.1007/s11085-009-9158-x
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ed3e0d3e6edef5db119870be579eedc8 https://doi.org/10.1007/s11085-009-9158-x Zobrazit plný text záznamu Full text from SpringerLink