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|Title:||XPS investigation of the oxidation/corrosion of melt-spun Mg|
|Citation:||Yao, H.B., Li, Y., Wee, A.T.S. (2000-05-01). XPS investigation of the oxidation/corrosion of melt-spun Mg. Applied Surface Science 158 (1) : 112-119. ScholarBank@NUS Repository. https://doi.org/10.1016/S0169-4332(99)00593-0|
|Abstract:||The oxide films formed on the surfaces of melt-spun Mg exposed to air, immersed in distilled water or 3% NaCl solution saturated with Mg(OH)2 have been investigated by X-ray photoelectron spectroscopy (XPS). High resolution XPS spectra revealed two distinct oxygen species on the surface films: one assigned to O2- in MgO, the other to OH- in Mg(OH)2. Depth profiling revealed that the two species had different depth distributions in the films. The oxide film formed in air comprised a contamination outer layer and a relatively thick (5-6 nm) predominantly MgO inner layer. The film formed in distilled water or 3% NaCl solution saturated with Mg(OH)2 was mainly a mixture of Mg(OH)2 and MgO. Mg(OH)2 was predominant at the top layer and decreased gradually with depth while MgO exhibited the opposite behavior. The corrosion product formed in 3% NaCl solution was more hydrated and much thicker that the films formed in the other two conditions. Cl- ion was incorporated in the oxide film formed in 3% NaCl solution. There exists both partial and complete dissociation of adsorbed water when melt-spun pure Mg ribbons are immersed in distilled water or 3% NaCl solution saturated with Mg(OH)2.|
|Source Title:||Applied Surface Science|
|Appears in Collections:||Staff Publications|
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