پروين درويشي

In this research, hydroxyapatite and hydroxyapatite-graphene oxide nanocomposite coatings with different weight percentages of graphene oxide, which were prepared by electrophoretic method, have been investigated. Ti-6Al-4V alloy substrate was used to investigate the effect of increasing the weight percentage of graphene oxide in the coating on improving the corrosion properties and adhesion to the substrate. In order to cover the substrate, suspensions of hydroxyapatite with 2, 1, 0 and 3% by weight of graphene oxide were prepared.To prepare these suspensions, isopropanol was used as a suspension liquid and triethanolamine as a dispersant. Then the coating was done by applying a DC electric field at a constant voltage of v30 for 5 minutes. After coating the samples, they were sintered in a tube furnace with an argon gas atmosphere at a temperature of 600°C. Characterization of the coatings was done by XRD, FTIR, SEM/EDS analysis, and the adhesion of the coatings was compared using the cross-cut method. The corrosion resistance behavior of the coatings was eva‎luated using electrochemical impedance spectroscopy (EIS).The obtained results showed that with the increase in the weight percentage of graphene oxide, the corrosion resistance of the coatings increases and the adhesion increases from class B1, where the separation percentage of the coating in this class is about 35-65%, to class B5, that is, without separation in the coating. The comparison of the obtained results indicated that the hydroxyapatite nanocomposite coating with 3% by weight of graphene oxide has a better performance than other coatings in terms of corrosion resistance and adhesion.

parvin darvishi

Hossein Arabi-Saeed Rastegari