Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 67: Poster Wednesday: Solid-Liquid Interfaces
O 67.3: Poster
Mittwoch, 3. April 2019, 17:45–20:00, Poster B2
First Principles Modeling of the Hydrogen Evolution Reaction in Mg Corrosion — •Tim Würger1,2, Mikhail Zheludkevich1, and Robert Horst Meißner1,2 — 1Helmholtz-Zentrum Geesthacht Centre for Materials and Coastal Research GmbH, Institute of Materials Research, Geesthacht, Germany — 2Hamburg University of Technology, Institute of Polymer and Composites, Hamburg, Germany
Magnesium is a material with a high potential for a variety of applications in areas such as transport, energy and medicine. However, the corrosion properties of magnesium restrict its practical application and are still not fully understood. One unresolved phenomenon is the anodic hydrogen evolution, also called negative difference effect. High corrosion rates and corresponding hydrogen evolution are observed under anodic polarization, whereas fundamental corrosion concepts indicate hydrogen evolution to occur at the cathodic site. Iron replating is proposed to be a possible reason for the observed negative difference effect. In the corrosion process, embedded iron impurities are set free and replate on the magnesium surface where they promote the hydrogen evolution. As there is still no consensus about the preferred reaction site and mechanism of the hydrogen evolution, further investigations on an atomistic level in Mg as well as Fe systems are supposed to bring clarity. Obtaining further knowledge about the reaction energetics is crucial to find the favored hydrogen evolution site and mechanism, leading to a deeper understanding of magnesium corrosion and thus opening up new perspectives in magnesium corrosion engineering.