Investigation of Microstructure and Corrosion Resistance of HA/Tio2 Coating Fabricated by Sol-Gel Method

Metal implants are widely used in medical and dental areas due to their good mechanical properties. The use of these metal implants in the corrosive environment of the body involves many problems, including the problems of corrosion-induced products that cause infection and cause the type of implants in the body to not function properly. In this research, sol-gel method was used to apply the hydroxyapatite / titanium dioxide coating on 316 Stainless Steel Alloy. All samples were coated with optimum conditions at 10 cm / min and pH =7, and then the corrosion resistance of the coatings was investigated in a ringer solution using potentiodynamic polarization and EIS methods. The composition of the coatings is also analyzed by XRD, EDX, FTIR. The morphology of the coating is determined by the scanning electron microscope (SEM). The results of the study showed that HA and TiO2 coatings and HA / TiO2 nanocomposite with 75, 50, 25% TiO2 coatings on a uniform thickness of 316 steel substrate. The results of the FESEM images showed that hydroxyapatite and titanium dioxide on the steel alloy 316 has uniform coverage and denser, and also by increasing the percentage of titanium dioxide nano hydroxyapatite / titanium dioxide from% 25 to% 50 It then becomes 75% nano-particles smaller and the coating becomes dense. Corrosion tests showed that the corrosion resistance of 316 Stainless Steel Alloy coated with nano HA / TiO2 by increasing the amount of TiO2 in the coating increases