Effect of Surface Roughness on Coating SiO2-P2O5-CaO-ZrO2 Upon Zirconium by Sol-Gel Method

Zirconium and its alloys have many applications in orthopedic medicine and have higher strength and corrosion resistance compared to stainless steel, titanium and other metals which are being used for manufacturing implants. This research shows that the method of preparation and surface modification before coating process has a significant impact on improving the metal implants among which is the sandblasting operation. The SiO2-P2O5-CaO-ZrO2 is coated on zirconium by sol-gel method and the impact of surface modification procedure on the grip is assessed. First, the chemical composition was determined by the quantometric test and then the surface roughness and morphology were analyzed before and after coating in two sandblasted and non-sandblasted modes by AFM. Coating morphology, structure and creating a structure without separation at the interface was investigated by Scanning Electron Microscope (SEM). Phase analysis and evaluation of chemical groups of the prepared samples before and after immersion in SBF solution were performed by XRD and FTIR, respectively. The results showed better coating of the surface after the sandblasting which isdue to increasing roughness from 2.940 to 19.74 nm for the sandblasted specimen and apatite formation of the coating after placement in the SBF solution for 21 days.