Characterization of Corrosion Resistance of Silver-Hydroxyapetite (Ag-HA) Bio-Nanocomposite Coating

Abstract

Silver-hydroxyapatite (Ag-HA) nanocomposite coating on stainless steel (316L) sheets was prepared by electroless deposition. Several studies have analysed the influence of bath composition on the corrosion behaviour of Ag-HA bio-nanocomposite coating produced by electroless deposition. Therefore, the present study compared the influence of varying concentrations of HA nanoparticles (0.1, 0.3, and 0.5) g/L on the mechanical (microhardness) and chemical (corrosion resistance and ion release) properties of the Ag-HA nanocomposite coating. The Ag-HA nanocomposite coating exhibited a remarkable increase in microhardness from 104.7 Hv to 139.9 Hv at 0.5 g/L HA nanoparticles and improved corrosion resistance, where the corrosion rate was enhanced for the coating from 5.954×10-1 mpy to 2.633×10-2 mpy in the presence of nano-HA. The ion release analysis of the element coating revealed that the nickel content was within the permissible limit in accordance with the amount of Ni permitted to exist inside the human body, and chromium was not found.

Keywords

• HA-Nanoparticles
• Ag-based nanocomposite coatings
• Electroless deposition technique
• Corrosion resistance