Corrosion resistance and antibacterial property of hydroxyapatite and Titanium oxide coating deposited by electrophoretic on Ti-13Nb-13Zr alloy

Abstract

The present paper describes coatings composed of the hydroxyapatite/ titanium oxide nanocomposite electrophoretic deposition (EPD) on a Ti13Nb13Zr substrate using the EPD technique. A uniform coating was produced after two minutes at a potential of 30 V. For the analysis of the coating layer's element distribution, an EDS detector was employed, as well as field emission scanning electron microscopy (FESEM) for the examination of the coating substrate's microstructure. In Ringer's solution, coated and uncoated samples were subjected to a potentiodynamic test to evaluate their corrosion behavior. At the ideal 2 min condition, a homogenous morphology and crack-free structure were achieved, together with the lowest porosity (1.5%) as a result of fine particle distribution that could fill the gaps between the particles and thus would prevent the agglomeration and maximum corrosion resistance (CR = 0.0025 mm/year, Rp = 185.04 kΩ.cm²). The current results indicate these materials can be used as a substrate coated with a bio composite hydroxyapatite/ titanium oxide layer for medical applications because they provide high corrosion resistance and enhance the antibacterial properties of the alloy.