Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 67: Metal surfaces: Adsorption of H/O and inorganic molecules

O 67.7: Vortrag

Donnerstag, 29. März 2012, 12:00–12:15, MA 043

Interactions of 2nd row high electron affinity elements with Mg(0001) — •Su-Ting Cheng, Mira Todorova, and Jörg Neugebauer — Max-Planck-Insitut für Eisenforschung GmbH, Düsseldorf, Germany

The high corrosion susceptibility of magnesium can be either beneficial or detrimental, depending on the application. For use in biodegradable implants fast, but controllable, degradation behavior is desirable. However, in engineering applications the low corrosion resistance of magnesium and its alloys is a considerable drawback.

Aiming to gain a better understanding of the corrosion behavior of Mg and its alloys we investigate the interaction of oxidizing species such as O, F, N and Cl with the Mg (0001) surface using density functional theory calculations. Accounting for the effect of the environmental conditions within a thermodynamic picture we find that adsorbate phases can only be stable kinetically and are always thermodynamically unstable with respect to the corresponding bulk compounds.