Effect of applied voltage and substrate preparation on surface modification of anodically oxidized titanium

摘要

In the present work, anodic oxidation (AO) treatment was used to modify surface ofcommercially-pure (CP) titanium. C.P-Ti ASTM grade 2 specimens, in two shapes of discand plate were prepared for this work. Disc titanium specimens were ground, polished andetched, while plate ones just etched. Afterwards anodic oxidation treatment performed inphosphoric acid electrolyte at 100, 200, and 300V. Crystalline structures of the substrateand grown films were evaluated using X-ray diffraction (XRD). Scanning electronmicroscopy (SEM) micrographs represented that by increasing the applied anodic voltage,the pore size increased, while the number of pores decreased. Energy-dispersive X-raySpectroscopy (EDS) analysis was performed to assay compositions of the prepared films.Roughness measurement of surface before and after anodic oxidation treatment indicatedthat etched plate samples had higher surface roughness than disc specimens. Moreoverroughness measurements represented that by applying higher voltage during anodicoxidation treatment, surface roughness increased due to arc-generation at high appliedvoltages, especially for those which anodized at 300V.