Applying Titania and Hydroxyapatite coating on Ti-6Al-4V by PEO and hydrothermal processes and investigating its corrosion behavior in simulated body environment

Subject Areas : journal of New Materials

چنگیز دهقانیان ¹ , مهدی شکوه فر ² , علی برادران گورانی ³ , مانی منتظری ⁴

1 - نویسنده
2 - نویسنده
3 - نویسنده
4 - نویسنده

Received: 2015-12-30 Accepted : 2015-12-30 Published : 2010-09-23

Keywords: Hydroxyapatite, Corrosion properties, Plasma Electrolytic Oxidation (PEO), hydrothermal treatment, . Ti-6Al-4V,

Abstract :

Titania porous bioceramic coating covered by hydroxyapatite causes the substrate to be more corrosion resistant and biocompatible. In this study, Ca and P contained titania was coated on Ti-6Al-4V alloy substrate by applying plasma electrolytic oxidation (PEO) with changing parameters such as time and voltages. After obtaining optimized sample, then it was treated hydrothermally at different time intervals until hydroxyapatite crystals were nucleated on titania porosities. Morphology and cross section, chemical composition, topography and hardness of the coating were investigated by scanning electron microscope (SEM), X-ray diffraction (XRD), Atomic force microscope (AFM) and nano indentation test, respectively. Also, the corrosion behaviors of the coating were studied by polarization and electrochemical impedance spectroscopy. According to the obtained results, hydrothermal treatment on optimized sample causes the formation of hydroxyapatite crystals in Titania porosities. These crystals are in nanometric dimensions and lumped shape. In addition, the coating on the substrate caused an increase in corrosion resistance of the sample in simulated body environment considerably

References:

1- Anita, V., Saito, N. and Takai, O. 2006. Micro-arc plasma treatment of titanium and aluminum surfaces in electrolytes. Thin Solid Films. 506-507: 364-368.

2- Barchiche, C.E., Rocca, E. and Hazan, J. 2008. Corrosion behaviour of Sn-containing oxide layer on AZ91D alloy formed by plasma electrolytic oxidation. Surface and Coatings Technology. 202:4145-4152.

3- Gu, W.C., Lv, G.H., Chen, H., Chen, G.L., Feng, W.R., Zhang, G.L. and Yang, S.Z. 2007. Investigation of morphology and composition of plasma electrolytic oxidation coatings in systems of Na₂SiO₃–NaOH and (NaPO₃)₆–NaOH. Journal of Materials Processing Technology. 182: 28-33.

4- Kasuga, T., Kondo, H. and Nogami, M. 2002. Apatite formation on TiO₂ in simulated body fluid. Journal of Crystal Growth. 235: 235–240.

5- Liu, D.M. 1996. Fabrication and characterization of porous hydroxyapatite granules. Biomnteriols. 17:1955-1957.

6- Liu, F., Wang, F., Shimizuc, T., Igarashic, K. and Zhao, L. 2005. Formation of hydroxyapatite on Ti–6Al–4V alloy by microarc oxidation and hydrothermal treatment. Surface & Coatings Technology. 199:220–224.

7- Manoa, T., Ueyamab, Y., Ishikawac, K., Matsumuraa, T. and Suzukic, K. 2002. Initial tissue response to a titanium implant coated with apatite at room temperature using a blast coating method. Biomaterials. 23:1931–1936.

8- Oshida, Y. 2007. Bioscience and Bioengineering of Titanium Materials. Elsevier BV. First edition.

9- Sun, J., Han, Y. and Huang, X. 2007. Hydroxyapatite coatings prepared by micro-arc oxidation in Ca- and P-containing electrolyte. Surface & Coatings Technology. 201:5655–5658.

10- Yang, X., Yu, S. and Li, W. 2009. Preparation of bioceramic films containing hydroxyapatites on              Ti–6Al–4V alloy surfaces by the micro-arc oxidation technique. Materials Research Bulletin. 44: 947– 949.