Corrosion properties of glassy Mg70Al15Ga15 in 0.1 M NaCl solution |
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Authors: | DI Uhlenhaut A Furrer PJ Uggowitzer JF Löffler |
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Affiliation: | Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich, Wolfgang-Pauli-Str. 10, 8093 Zurich, Switzerland |
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Abstract: | The corrosion behavior of glassy Mg70Al15Ga15 was investigated in 0.1 M NaCl solutions of various pH values. Potentiodynamic polarization measurements confirm a pronounced passivity for 4 ≤ pH ≤ 12. Corrosion currents in neutral solutions are found to be as low as 10?6 A/cm2. Optical microscopy and Auger electron spectroscopy were performed on samples immersed under open-circuit conditions in neutral, acidic and alkaline 0.1 M NaCl solutions to observe their time-dependent passive film formation. A significant incorporation of aluminum in the surface layers was found. The alloys show an unusual stability against dissolution in chloride-containing solutions, raising expectations of a highly corrosion-resistant Mg-based alloy. The time-dependent limitations of this stability are discussed in context with the surface films observed. |
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