| Abstract Scope |
To understand the corrosion behavior due to changes in alloying composition, three separate magnesium alloys, namely Mg3Si, ZK60, and AZ31 were processed via the Shear Assisted Processing and Extrusion (ShAPE) technique. Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) based microstructure characterization revealed a refined microstructure with ShAPE processing in each alloy. A comparative corrosion response between cast and ShAPE processed alloys was studied by different electrochemical measurements such as potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), galvanostatic-potentiostatic cycle, and atomic emission spectroelectrochemistry analysis (AESCE). The extent and variation in dissolution-induced cathodic activation were found to vary with different alloy microstructures. To further understand the underlying mechanism, post-corrosion microstructures were analyzed with high-resolution microscopy and spectroscopy techniques. The result indicates that a particular processing method can have variation in corrosion response which depends strongly on alloying compositions, i.e., second phase particles and solute distribution of feedstock. |