<p>AlSi12 alloy components are susceptible to wear and corrosion damage during service. For the purpose of extending their service life, this study employed laser deposition technology with AlSi7Mg alloy powder to repair the damaged surfaces. The repair effectiveness was evaluated by comparing the tensile properties, wear resistance, and electrochemical corrosion performance of the repaired specimens with those of the base material. A systematic analysis was conducted on the microstructure, phase composition, and grain boundary characteristics of both the repaired zone and the base material. The results indicate that the repaired zone achieved excellent metallurgical bonding with the base material without interfacial cracks or defects. The average microhardness of the repaired zone reached 1.4 times that of the base material. The tensile strength and elongation at break reached 98.2% and 91.1% of the base material’s values, respectively. The wear rate and average friction coefficient of the repaired zone decreased by 37% and 27%, respectively, compared to the base material. The charge transfer resistance increased from 1399 to 2659 Ω·cm², while the corrosion current density decreased from 578.1 to 384.6 μA·cm⁻², indicating significantly enhanced corrosion resistance. This study provides theoretical support for the high-performance repair of AlSi12 alloy components.</p>