Antibacterial Properties Of Stainless Steel Implanted By Ag/Zn

With the improvement of people's living and health level, antibacterial stainless steel has attracted much attention due to its structural and functional properties. In this work, martensite stainless steel sample was implanted by Ag/Zn ions at an extracting voltage of 47KV. The structural properties of Ag/Zn implanted stainless steel were studied by Atom Force Microscope (AFM), X ray Photoelectron Spectroscopy (XPS), and surface tensiometer. The corrosion resistance was characterized by electrochemical polarization curve.Depth profile analysis shows that the Ag/Zn implanted layer is about 70nm in thickness under an implantation dose of 2×10¹⁷ ions/cm² for Ag and Zn ions at an extracting voltage of 47KV. The depth of the peak concentration of Ag and Zn ions is both 20nm. XPS analysis also shows that silver exists in Ag+ and Zn exists in Zn2+, according to the distribution of bingding energy.The results of AFM show that surface roughness of peak-valley decreases continuously with the increasing of implantation doses. The contact angle analyses imply that surface hydrophobic property of implanted stainless steel are increased with the increasing of implantation doses. The most hydrophobic property is observed with the implantation dose of 2×10¹⁷ ions/cm² Ag ion and 2×10¹⁷ ions/cm² Zn ion. Polarization curve show that the corrosion resistance are also increased with the increasing of implantation dose.The antibacterial properties of Ag/Zn implanted stainless steel were investigated in vitro using Eschericha coli and Candida albicans. The stainless steel implanted by single Ag ion shows good antibacterial property to Escherichia coli but poor antibacterial property to Candida albicans. The stainless steel implanted by Ag/Zn ions shows good antibacterial property to both Escherichia coli and Candida albicans, with the implantation dose of 2×10¹⁷ ions/cm² Ag ion and 4×10¹⁷ ions/cm² Zn ion.