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Miniño, P.
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Publications (3/3 displayed)
- 2012An XPS analysis of the oxide surface layers formed on a friction stir processed magnesium alloycitations
- 2012FIB and SEM-STEM Studies of Friction-stir Processed AM60 Magnesium Alloy
- 2011Friction Stir Welding and Processing VI - Obtaining Sub‐Micron Grain Size in AM60 Magnesium Alloy Using Friction Stir Processingcitations
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article
An XPS analysis of the oxide surface layers formed on a friction stir processed magnesium alloy
Abstract
Friction stir processing (FSP) is a promising technique for improving plasticity of magnesium alloys through the homogenization and grain refinement of their structure. In this study, a magnesium alloy AZ31 has been processed by FSP to achieve an ultrafine grain size structure (700 nm), and the oxide films formed spontaneously on the surface of the FSP zone are compared with those on the unprocessed material. Chemical composition of the oxide films are analyzed by XPS.The natural oxide films, close to 36 nm, can be described as a structure of (MgO)/Mg(OH)2 with the outermost surface mainly formed by Mg(OH)2/MgCO3. About 5–7 at.% of Al3+ is distributed through the oxide layer. Segregated zinc enrichment (Zn 2p3/2 at 1021.4 eV) at the interface oxide/metal is found. The FSP samples show higher carbonatation degree at the surface and a lower segregated zinc percentage at the interface oxide/metal. Copyright © 2012 John Wiley & Sons, Ltd.