This study investigates the regulation of surface strengthening of AA7075 aluminum alloy via rolling and cold rolling processes, so as to enhance its mechanical properties and pitting corrosion resistance. It further explores the influence mechanism of surface rolling treatment on the enhancement of mechanical properties and surface properties of AA7075 aluminum alloy. Samples of 30‐S‐Al, 50‐S‐Al, and annealed alloy were employed to quantitatively analyze the effect of surface strengthening of 30‐S‐Al and 50‐S‐Al on their microstructure evolution process. The 50‐S‐Al treatment proved most effective, with a surface hardness of 416 HV 5 ,approximately double the annealed sample's hardness and an 80% increase. Characterization revealed that rolling significantly increases surface dislocation density. Crucially, 50‐S‐Al fractures and disperses second‐phase particles, a key strengthening mechanism for plasticity. Corrosion resistance was evaluated via hydrogen evolution and electrochemical tests. The 50‐S‐Al treated alloy exhibited superior performance: a self‐corrosion current density of 125.57 µA/cm 2 , a self‐corrosion potential of −0.922 V, a notably higher pitting potential (increase of 0.15 V), and the highest impedance (110,160 Ω·cm 2 ). A fine and uniform microstructure is formed on the surface layer of the 50‐S‐Al alloy, and the grain size refined in the deep layer is sufficiently small. This promotes the passivation enhancing pitting and corrosion resistance.
Shen et al. (Sat,) studied this question.
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