Dresden 2006 – scientific programme
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DS: Dünne Schichten
DS 24: Poster presentation
DS 24.61: Poster
Tuesday, March 28, 2006, 15:00–17:30, P2
Development of Corrosion Resistant Mg-Alloys using Ion Beam Sputter Technologies — •Yvonne Bohne1, Stephan Mändl1, Bernd Rauschenbach1, Carsten Blawert2, and Wolfgang Dietzel2 — 1Leibniz-Institut für Oberflächenmodifizierung, Leipzig, Germany — 2Center for Magnesium Technology, GKSS Forschungszentrum Geesthacht GmbH, Germany
Magnesium alloys offer a high potential for use as lightweight structural material in transport applications as automotive and aerospace. However, magnesium is a reactive metal, therefore corrosion protection is an issue of great importance. By ion beam sputtering (IBS) solid solution magnesium alloys can be deposited on various substrates such as commercial magnesium alloys or Si. This employed method has decisive advantages, insertion of alloying elements above the equilibrium solubility is are possible and phases far away from the thermodynamic equilibrium can be obtained, both with improved corrosion resistance. Binary (Mg-Al, Mg-Ti and Mg-Si) and ternary alloys were deposited in this experiment. For characterization, the layers were investigated by RBS, ERDA and SIMS to determine the chemical composition and by REM and XRD to study the microstructure and phase composition. For the new unconventional alloys based on Mg-Ti and Mg-Si (high Si concentrations) the corrosion properties were studied by potentiodynamic polarization, polarization resistance and electrochemical impedance techniques. For the Mg-Al system effects of the microstructure on the corrosion behaviour was studied by comparing as cast material and coatings. (Supported by the DFG in the course of the priority program 1168)