Journal
SURFACE AND INTERFACE ANALYSIS
Volume 38, Issue 10, Pages 1363-1371Publisher
WILEY
DOI: 10.1002/sia.2463
Keywords
magnesium; surface; oxidation; PM-IRRAS; XPS; water contact angle
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The changes in the surface chemistry of the oxidised surface of evaporated magnesium metal stored in the ambient atmosphere are studied with water contact angle (WCA) measurement, polarisation-modulation infrared reflection-absorption spectroscopy (PM-IRRAS) and X-ray photoelectron spectroscopy (XPS). Upon exposure to the ambient atmosphere, the surface picks up volatile organic compounds (VOC), which cause a significant increase in the WCA values. The PM-IRRAS and XPS analyses indicate that the adsorbates contain hydrocarbons, carboxylates and carbonate functionalities. After long ambient storage times, the composition of the carbon-containing functionalities on the surface changes significantly. This change could be caused by the build-up and/or surf ace-catalysed oxidation of adsorbed organic species. Thickening of the air-formed oxide/hydroxide layer was also noted, ascribed to the reaction of adsorbed atmospheric moisture with the magnesium surface. Copyright (C) 2006 John Wiley & Sons, Ltd.
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