<p>Although AA7075 alloy exhibits high strength, it remains susceptible to pitting, intragranular corrosion, and stress corrosion cracking (SCC) in complex service environments. This study systematically investigates the microstructural evolution and property regulation of AA7075 alloy under T6 and multiple retrogression and re-aging (RRA) treatments. The results indicate that appropriate RRA treatment can optimize SCC resistance, which is closely related to the grain boundary precipitates. Electrochemical measurements, combined with pitting and intergranular corrosion tests, reveal that microstructural features significantly influence corrosion behavior. Pitting initiation preferentially occurs at Fe-containing secondary phases, with Si further promoting pitting formation. Cracks tend to initiate in pitting regions near grain boundaries and propagate accompanied by grain fragmentation and orientation disorder. Anodic dissolution of Mg²⁺ and Zn²⁺ enriched phases at grain boundaries further promotes crack propagation. These findings demonstrate that microstructural evolution plays a critical role in determining the corrosion resistance of AA7075 alloy, offering both mechanistic understanding and practical guidance for optimizing heat treatment processes of high-strength aluminum alloys in aggressive environments.</p>