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Effect of Current Density on Anodised Titanium in Mixture of β-Glycerophosphate (β-GP) and Calcium Acetate (CA)

Anodic oxidation is an electrochemical method for the production of ceramic films on a metallic substrate. It had been widely used to deposit the ceramic coatings on the metals surface. In this study, the surface morphology and crystallinity of titanium foil was modified by anodising in mixture of β-glycerophosphate disodium salt pentahydrate (β-GP) and calcium acetate monohydrate (CA). The experiments were carried out at high voltage (350 V), different anodising time (1, 3, 5 and 10 min) and current density (10 and 20 mA.cm-2) at room temperature. Anodised titanium was characterised by using glancing angle X-ray diffraction (GAXRD), field emission scanning electron microscope (FESEM) and focused ion beam (FIB) milling. The result of the experiment show that colour, porosity, crystallinity and thickness of the titanium films depended strongly on the current density. More porous surface and large amount of anatase was produced at higher current density. FIB results indicated that the thickness of oxide layer increased as increasing of current density.