Local and global electrochemical impedances applied to the corrosion behaviour of an AZ91 magnesium alloy

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Electrochemical Impedance Spectroscopy for the Measurement of the Corrosion Rate of Magnesium Alloys: Brief Review and Challenges (2020, methodology): “Some works [69,73,75] have suggested the formation of uni-positive Mg+ ions as reaction intermediates on the surface of Mg alloys during the corrosion process, and other recent works [9] have questioned its existence.”
Comparison of different methods for measuring the passive film thickness on metals (2016, unknown): “However, it may result in difficulties for physical interpretation as soon as a time-constant distribution appears [10,11], which is usually represented in the equivalent circuit by a constant phase element (CPE).”