<p>This study examined the effects of solution treatment and aging on the microstructure, mechanical properties, and corrosion behavior of AA6061 aluminum alloy under applied stress. Samples were solution treated (Al-ST), aged for 6&#xa0;h (Al-AG6) and over-aged for 18&#xa0;h (Al-AG18). Microstructure and mechanical properties were characterized using optical microscopy and tensile testing, respectively, while corrosion behavior under uniaxial tensile loading in 3.5% NaCl solution was evaluated using potentiodynamic polarization, post-polarization SEM, and electrochemical impedance spectroscopy (EIS). Mechanical testing showed that Al-AG6 achieved the highest strength with moderate ductility, making it optimal for structural applications. Potentiodynamic polarization revealed a negative shift in corrosion potential (<i>E</i>_corr) and an increase in corrosion current density (<i>i</i>_corr) under tensile loading, with Al-AG18 exhibiting the greatest increase in corrosion rate. EIS further confirmed this trend, with the greatest reduction in charge-transfer resistance (<i>R</i>_ct) and increase in constant phase element (CPE) with double layer (<i>Y</i>_dl) for Al-AG18, linking electrochemical response to microstructural degradation. Ultimately, optimizing the microstructural states is vital for improving the mechanical performance and corrosion resistance of AA6061 alloy for stress-bearing structures in saline environments.</p>