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Mechanism behind the Inhibiting Effect of CO2 on the Oxidation of Al−Mg Alloys

Smith, Nicholas Albert; Gleeson, Brian; wissam, saidi; Kvithyld, Anne; Tranell, Gabriella
Journal article, Peer reviewed
Accepted version
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URI
http://hdl.handle.net/11250/2607748
Date
2018
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  • Institutt for materialteknologi [2407]
  • Publikasjoner fra CRIStin - NTNU [34985]
Original version
10.1021/acs.iecr.8b04691
Abstract
Al–Mg alloys are known to suffer from problematic oxidation during melting, refining, and casting. The use of a CO2/air cover gas is known to minimize this oxidation; however, a mechanistic understanding of the beneficial inhibiting effect is lacking. A series of thermogravimetric experiments were conducted under a variety of different CO2-containing atmospheres at 750 °C to elucidate the inhibiting effect. Characterization of the oxide layer was done by surface and cross-sectional analysis in the electron microscope and X-ray photoelectron spectrometry (XPS) depth profiling. It was found that additions of as little as 5% CO2 to air delayed the onset of breakaway oxidation for at least 7 h and gave a notable reduction in the mass gain compared to that seen upon exposure to air at 750 °C. The XPS depth profile showed a carbon-containing layer due to adsorbed CO2 at the top surface of the oxide layer. It was inferred that this carbon-containing layer slowed the transport of Mg vapor from the metal through the oxide layer, resulting in a reduction in the amount of Mg vapor available for oxidation.
Publisher
American Chemical Society
Journal
Industrial & Engineering Chemistry Research

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