Study on the electrochemical corrosion resistance of 5083 aluminum alloy under heat treatment processes

This study systematically investigates the influence mechanisms of heat treatment processes on the electrochemical corrosion resistance of hot-rolled 5083 aluminum alloy sheets, aiming to provide theoretical support for enhancing the service life of marine aluminum alloys. By integrating first-principles calculations with experimental data, the evolution patterns of second-phase composition and size under different annealing temperatures and holding times were revealed, elucidating their impact mechanisms on corrosion behavior. Conclusions: The typical second phases in 5083 aluminum alloy are Mg 2 Si, Al 6 Mn, Al 3 Ce, Al 3 Fe, and Al 6 (Mn, Fe). Between 150–400 °C, second phase particle size slightly decreased, while it significantly increased at 400–500 °C. Electrochemical test results indicate that the corrosion resistance of 5083 aluminum alloy is poorest at an annealing temperature of 350 °C. The variation in corrosion resistance primarily depends on the evolution of the β phase (Al 3 Mg 2 ) and the dissolution and coarsening of the Al 6 Mn, Al 3 Fe, and Al 6 (Mn, Fe) phases. • Detailed statistics on the number of second-phase dimensions. • Analysis of the Mechanism of Resistance to Electrochemical Corrosion from the Perspective of Second-Phase Particles. • First-principles simulations validate experimental findings.