Abstract
Hydrogen evolution testing and anodic potentiodynamic polarization revealed that Y addition has a beneficial effect on the corrosion resistance of melt-spun amorphous Mg–Cu ribbon, which is related to the properties of the surface film of Mg–Cu and the manner in which its properties are modified as a result of Y alloying. X-ray photoelectron spectroscopy (XPS) depth profiling revealed that the breakdown of Mg–Cu was caused by the hydration of surface oxide components and the incorporation of detrimental CO 32– anions into the surface film. Y addition in Mg–Cu improves the corrosion resistance by Y 2 O 3 incorporation into the passive film, thus stabilizing the surface oxide components from hydration and preventing the incorporation of CO 32– into the passive film.
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