Biocompatibility and electrochemical behavior of chemical deposited hydroxyapatite coating on titanium based alloy

3^rd International Conference and Exhibition on Materials Science & Engineering

October 06-08, 2014 Hilton San Antonio Airport, USA

E Vasilescu, J Hmeljak, A Coer, C Vasilescu, S I Drob, J Calderon Moreno and M Popa

Accepted Abstracts: Material Sci Eng

Abstract :

In this paper, a nano-crystalline hydroxyapatite (HA) coating was applied on the surface of the new Ti-20Nb-10Zr-5Ta alloy by method of the chemical deposition in a solution supersaturated with Ca2+ and PO4 3- ions; X-ray diffraction, micro-Raman, infrared and energy dispersive X-ray spectroscopies detected the deposition of HA on the Ti-20Nb-10Zr-5Ta alloy surface after 6 soaking hours. Scanning electron microscopy ascertained the complete coverage of the alloy surface and the typical features of the HA coating acicular nano-crystallites. The coating long-term electrochemical behaviour for 3000 soaking hours in simulated human fluids (Ringer?s solutions of different pH values) was studied by cyclic potentiodynamic and linear polarization, electrochemical impedance spectroscopy and monitoring of the open circuit potentials and corresponding open circuit potential gradients due to the pH nonuniformity of the biofluid. All the main electrochemical and corrosion parameters had more favorable values for the HA coated alloy than those of the bare alloy due to the protective effects of the nano-coating that acts as a barrier against the dissolution of the metallic substrate. The initial HA nano-coating promoted the deposition of new HA layers, thickening itself and showing its ability to induce the formation of this main inorganic component of the human bone, therefore denoting bioactivity of the HA nano-coated alloy. Also, the coating biocompatibility was performed by cells adhesion and proliferation testing in the HA coated bioalloy extract compared to the un-coated bioalloy extract. HA coated bioalloy is better tolerated by human osteoblast cells.

Biography :

E Vasilescu has completed his PhD at the age of 30 years from Institute of Physical Chemistry ?Ilie Murgulescu? of Romanian Academy and postdoctoral studies from University of Bucharest. She is Senior Researcher at Institute of Physical Chemistry ?Ilie Murgulescu?, Bucharest, Romania. She has published more than 115 papers in reputed journals regarding the passive film formation and reactivity, technical and functional characteristics and corrosion behavior of new biomaterials for orthopedic and dental implants.