This study presents an innovative approach to creating antibacterial aluminum surfaces by combining the antibacterial properties of silver nanoparticles (Ag NPs) with the nanoarchitecture of anodized aluminum oxide in one step. An Al-Ag alloy containing 10 wt % Ag was synthesized and anodized in 0.3 M oxalic acid. Ag NPs precipitated in the solid state during anodization, resulting in a porous nanocomposite structure. Comprehensive characterization using SEM, TEM, and EDS revealed a 43 μm thick oxide layer with uniformly distributed nanopores of approximately 100 nm in diameter. Ag NPs with diameters ranging from 2 to 14 nm precipitated dispersed on the surface, inside pores, and within the Al