FORMATION AND CHARACTERISTICS OF HYDROXYAPATITE FILM GROWN ON TITANIUM ALLOY Ti-6Al-4V SUBSTRATES BY ANODIC TREATMENT

Van-Thoai Nguyen; Ching-Yin Kang

Van-Thoai Nguyen Hung Yen University of Technology and Education
Ching-Yin Kang National Kaohsiung University of Science and Technology, Kaohsiung 807, Taiwan

Keywords: Titanium Alloy, Anodic Oxidation, Simulated Body Fluid, Hydroxyapatite

Abstract

This study presents a method for synthesizing hydroxyapatite (HA) on the Ti-6Al-4V substrate by using a solution containing calciumd acetate (CA), calcium glycerophosphate hydrate (Ca-GP), and different concentrations of H₂SO₄ as the electrolyte for anodic treatment. The results found that the anodic method is suitable for Ti-6Al-4V titanium alloy to form an oxide film containing Ca and P that will promote HA growth. Moreover, these anodic oxide films display a highly porous structure on the sample surface. This reduces the induction time of the HA crystals and the time required for the surface to be completely covered by HA after the samples are immersed in simulated body fluids (SBF). Besides, at a higher concentration of H₂SO₄ , the anodic oxide films containing more Ca that will increase the apatite nuclei and promote the growth of HA was easily obtained in the electrolyte with CA, Ca-GP.

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