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Characterization of AZ91 magnesium alloy and organosilane adsorption on its surface

TitleCharacterization of AZ91 magnesium alloy and organosilane adsorption on its surface
Publication TypeJournal Article
Year of Publication2007
AuthorsKim, J, Wong, KC, Wong, PC, Kulinich, SA, Metson, JB, Mitchell, KAR
JournalApplied Surface Science
Volume253
Pagination4197-4207
Date PublishedFeb
ISBN Number0169-4332
Abstract

Oxide formation on a clean AZ91-Mg alloy surface has been characterized by X-ray photoelectron spectroscopy (XPS), while the chemical composition of a mirror-polished sample was assessed by scanning Auger microscopy (SAM) and scanning electron microscopy (SEM) at different microstructural regions, referred to as the grain boundary, matrix and particle regions. XPS and SAM confirmed that Mg and Al are always present in the surface regions probed, whereas bulk characterization with energy dispersive X-ray (EDX) analysis was necessary to detect the additional alloying elements, Mn and Zn. Coating by 1% solutions of BTSE, gamma-GPS and gamma-APS at their natural pH values gave etching of the surface Mg oxide. Adsorption occurs on the different regions, but the attachment is weak, especially because of the fragile nature of the underlying substrate. However, increasing the concentration of BTSE to 4% formed a thicker and denser coating with better prospects for substrate protection. (c) 2006 Elsevier B.V. All rights reserved.

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