Journal
CORROSION SCIENCE
Volume 51, Issue 5, Pages 1115-1127Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2009.02.017
Keywords
Magnesium; Intermetallics; XPS; Surface films; Dealloying
Funding
- Australian Research Council
- Centre of Excellence
- Design of Light Alloys in Australia
- CNRS in France
- Furthermore
- Complex Metallic Alloy (CMA) Network of Excellenc
- European Research Commission [NMP3-CT-2005-500140]
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An XPS investigation was carried out of the surface films, formed by exposure to ultrapure water, on mechanically ground Mg and the two Mg-Al intermetallic compounds: Al3Mg2 and Mg17Al12. The mechanically ground Mg surface had a film of MgO at the Mg metal surface covered by a Mg(OH)2 layer. formed by the reaction of the MgO with water vapour in the air. Upon immersion in ultrapure water, this film converted to a duplex film with an inner MgO layer next to the Mg metal and an external porous hydroxide layer. For both intermetallics, the XPS data is consistent with (i) preferential dissolution of Mg and (ii) a 10 nm thick film on the surface after immersion in ultrapure water; the film composition on Al3Mg2 was AlMg1.4O0.2(OH)(5.4) whilst on Mg17Al12 the composition was AlMg2.5(OH)(8). (C) 2009 Elsevier Ltd. All rights reserved.
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