MICRO-ARC OXIDATION ENHANCES MECHANICAL PROPERTIES AND CORROSION RESISTANCE OF TI-6AL-7NB ALLOY

Investigation results of micro-arc coating on the (Ti-7Nb-6Al) alloy were presented. It has potential clinical value in applications such as dental implant, knee, and hip prostheses. An electrolyte solution of ( Na2CO3 + Na2SiO3). The micro-arc oxidation (MAO) technique was employed for in situ oxidation of Ti-6Al-7Nb surface. The wettability of a porous TiO2 covering made up of anatase and rutile phases was investigated. The test findings revealed that the possibility of deposition of ceramics coatings on the surface of Ti-6Al-7Nb alloy by using voltages (400V )at different deposition times (7, 15, and 30) min. The results indicate that ceramics layer of titanium oxide (TiO2) which is formed during coating porous and homogenous distribution. The bioactive composition of the oxide layers can be suitable for use as advanced biomedical implants. The coatings also revealed an increased surface roughness, porosity, microhardness, surface wettability and corrosion resistance of the Ti-6Al-7Nb substrate reaches to (CR= 0.1114x10-3mpy) in Ringer's solution and (CR= 1.03x10-3mpy) in Saliva's solution with increased deposition time.