Journal
CORROSION SCIENCE
Volume 77, Issue -, Pages 151-163Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2013.07.038
Keywords
Magnesium; Alloy; TEM; STEM
Funding
- General Motors Canada
- Natural Sciences and Engineering Research Council of Canada (NSERC)
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Site-specific analytical electron microscopy was performed on a corroded sand-cast AM50 alloy. Areas close to partially divorced eutectic were the regions with less corrosion damage. The corrosion product layer in these areas consisted of a columnar section of predominantly amorphous MgO. At the alloy interface, an aluminum-rich layer was identified. Electron energy-loss spectroscopy suggests this layer is metallic in character. The corrosion product film on the primary alpha-Mg grains possessed a bi-layer morphology: a thin columnar film and a thicker, porous sub-layer. The formation of the Al-rich layer depends on the Al content in solid solution at a specific location. (C) 2013 Elsevier Ltd. All rights reserved.
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