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This study aimed to carry out the friction stir processing (FSP) modification of 7075 aluminum alloy mainly by slotting the base metal and adding the reinforcing phase, and to explore the electrochemical corrosion performance of the modified area. The results showed that the added phases with different mass fractions of TiB 2 , TiC, and C f  were beneficial to improve the electrochemical corrosion performance of the modified area. Among them, the TiB 2  and TiC at different mass fractions had a relatively small improvement in the electrochemical corrosion performance of the FSP-modified area of the base metal, and both had a negative effect when the mass fraction was 5%. The C f  addition phase with a mass fraction of 2% had the most obvious improvement effect. Its corrosion potential  E0  was −0.771 V, and the corrosion current density  I0  was 4.80875E-6 A · cm 2 . The analysis showed that the electrochemical performance of C f  and the bonding performance with the base metal were better, and the corrosion process of the base metal could be suppressed during the corrosion process.

Microscopic characteristics and corrosion resistance of 7075 aluminum alloy modified by friction stir processing