Preparation and properties of Ag-containing porous layer on 6061 aluminum alloy surfaces

This study focused on the preparation of Ag-containing porous layers on the surface of a 6061 aluminum alloy using different voltages. The microstructure, Ag deposition form, corrosion resistance, and antibacterial properties of the Ag-containing porous layers on the 6061 aluminum alloy were analyzed using scanning electron microscopy, X-ray photoelectron spectroscopy, electrochemical workstation, and antibacterial tests. The results indicated that the Ag-containing porous layer prepared at 30 V exhibited the highest Ag deposition and antibacterial rate, amounting to 1.78 wt% and 99.73 %, respectively. The deposited Ag mainly existed in the form of Ag+ combined with O2− and SO42− within the Ag-containing porous layers. Compared to that of the 6061 aluminum alloy matrix, the Ag-containing porous layer prepared at 30 V had a wear volume of 0.015 mm3, a reduction of 98.37 %, an increase in the corrosion potential (Ecorr) to −0.485 V, and an increase of 0.848 V. In conclusion, Ag-containing porous layers demonstrated significant antibacterial, wear resistance, and corrosion resistance properties. •The effect of voltage on the pore size and porosity of the porous layer was investigated.•Analyze the microstructure, Ag distribution and morphology of the Ag-bearing porous layer.•The role of silver in enhancing the wear resistance, corrosion resistance, and antibacterial properties of the porous layer was investigated.•The release process of silver ions and the antibacterial mechanism were explored.