A Study the Effect of porosity of Bio-Active Ceramic Hydroxyapatite Coated by Electrophoretic Deposition on the Ti6Al4V Alloy Substrate

Bone implant materials which are composed of the Ti-6Al-4V alloy are usually utilized as a result of its bio-compatibility and corrosion resistance. This alloy isn’t bio-active, and that results in making it easy to release the cation Al and V when implanted into the human body. Therefore, this study aims to focus on the effect of different current direct current (DC)and alternating current (AC) on the electrophoretic deposition (EPD) variables (voltage, time and concentration) of the Hydroxyapatite (HA) powder upon the Ti6Al4V alloy substrate. EPD process was depended on the coating thickness and surface roughness, and then characterizations of the coating layer were performed. The suspensions zeta potential was measured to recognize charge upon the particles and their stability. The coating thickness was measured at different EPD variables. The cross-section of coating thickness and the morphology of surface were investigated employing optical and SEM microscopes. The density of coating porosity was computed from the micrograph images. Results manifested that the samples having the same thickness possess a higher grain density if coated utilizing (AC) EPD in comparison to (DC) electrophoretic deposition. The contact angles values of coatings have been changed from hydrophobic in the case uncoated Ti6Al4V 67.489°C to the hydrophilic by using (DC) current 35.914°C and 38.13 ° C by using(AC).