Nanotube Nucleation Phenomena of Titanium Dioxide on the Ti-6Al-4V Alloy Using Anodic Titanium Oxide Technique.

The purpose of this study was to investigate nanotube nucleation phenomena of titanium dioxide on the Ti-6Al-4V alloy were investigated using anodic titanium oxide technique. Heat treatment was performed at 1000 degrees C for 12 hour for formation of α+/β phase and water quenched. Ti-6Al-4V alloy was anodized in 1 M H3PO4 electrolytes containing 0.8 wt.% NaF at room temperature. After formation of nanotube was achieved, nanotube layer was eliminated, and then anodization was carried out repeatedly. The microstructures, phase transformation, and morphology of nanotubular Ti-6Al-4V alloy was examined by optical microscopy, X-ray diffraction (XRD), field emission scanning electron microscopy and atomic force microscopy. Microstructures of Ti-6Al-4V alloy showed the β structure with a phase. From XRD pattern of Ti-6Al-4V alloy after heat treatment, β peak was increased, whereas, a peak was decreased. The surface morphology appeared regular nanotube on a phase, whereas, nanotube morphology was not shown on the β phase. α and β phases were affected to form the nanotube of Ti-6Al-4V alloy.