Synergistic enhancement of electrochemical performance in AA2024 aluminum alloy processed through severe plastic deformation with nanostructured architecture for innovative applications

This study provides new insights into the influence of grain refinement and crystallographic texture on the passivation behavior and electrochemical response of AA2024 aluminum alloy in phosphate buffer solution (pH 9). A nano-grained (NG, 100–150 nm) microstructure with high-intensity 011 orientations, i. e. , Goss 011, Brass 011, and P 110 texture components, was produced through cross accumulative roll bonding (CARB) technique. Electrochemical tests reveal a ~40% reduction in corrosion current density (Icorr) for the NG alloy compared to its coarse-grained (CG) counterpart. Electrochemical impedance spectroscopy (EIS) confirmed this, showing a passive film resistance approximately one order of magnitude higher for the NG material. Consequently, these findings illustrate that the CARB technique concurrently refines grains and develops a favorable texture, synergistically enhancing passivation to provide exceptional corrosion resistance in AA2024 alloy.