About this Abstract |
Meeting |
12th International Conference on Magnesium Alloys and their Applications (Mg2021)
|
Symposium
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12th International Conference on Magnesium Alloys and their Applications (Mg 2021)
|
Presentation Title |
The Role of Native Oxides on the Corrosion Mechanism of Laves Phases in Mg-Al-Ca Composites |
Author(s) |
Daniela Zander, Markus Felten, Jakub Nowak, Patrick Grünewald, Florian Schäfer, Christian Motz |
On-Site Speaker (Planned) |
Markus Felten |
Abstract Scope |
Magnesium-Aluminum-Calcium composites are characterized by thermally stable Laves phases, which enable high-temperature material applications. Nevertheless, immersing the material into an electrolyte causes an increased corrosion rate as a consequence of micro galvanic effects among the Laves phases and the matrix. The Volta potential difference determined under atmospheric conditions on a freshly polished surface using Scanning Kelvin Probe Force Microscopy (SKPFM) is a valid measure for the micro galvanic coupling and the dynamic growth kinetics of a native oxide film.
In the present study, the time-dependent native oxide film formation of Magnesium-Aluminum-Calcium alloys is analyzed via in situ SKPFM measurements. An inhomogeneous evolution of the Volta potential on the Laves phases compared to the matrix indicates heterogeneous native oxide formation. Dependent on the stability of the native oxide film in strongly alkaline electrolytes, the conducted measurements evaluate the corrosion behavior under these conditions. |
Proceedings Inclusion? |
Planned: At-meeting proceedings |