XPS investigation of the oxidation/corrosion of melt-spun Mg

H. B. Yao; Y. Li; A. T.S. Wee

doi:10.1016/S0169-4332(99)00593-0

XPS investigation of the oxidation/corrosion of melt-spun Mg

H. B. Yao^*
, Y. Li
, A. T.S. Wee

^*Corresponding author for this work

National University of Singapore

Research output: Contribution to journal › Article › peer-review

309 Scopus citations

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 O^2- 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.

Original language	English
Pages (from-to)	112-119
Number of pages	8
Journal	Applied Surface Science
Volume	158
Issue number	1
DOIs	https://doi.org/10.1016/S0169-4332(99)00593-0
State	Published - 1 May 2000
Externally published	Yes

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title = "XPS investigation of the oxidation/corrosion of melt-spun Mg",

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.",

author = "Yao, \{H. B.\} and Y. Li and Wee, \{A. T.S.\}",

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doi = "10.1016/S0169-4332(99)00593-0",

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T1 - XPS investigation of the oxidation/corrosion of melt-spun Mg

AU - Yao, H. B.

AU - Li, Y.

AU - Wee, A. T.S.

PY - 2000/5/1

Y1 - 2000/5/1

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/0033723018

U2 - 10.1016/S0169-4332(99)00593-0

DO - 10.1016/S0169-4332(99)00593-0

M3 - 文章

AN - SCOPUS:0033723018

SN - 0169-4332

VL - 158

SP - 112

EP - 119

JO - Applied Surface Science

JF - Applied Surface Science

IS - 1

ER -

XPS investigation of the oxidation/corrosion of melt-spun Mg

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