Paper Title:
Effect of Electrolyte Chemistry on the Structural, Morphological and Corrosion Characteristics of Titania Films Developed on Ti-6Al-4V Implant Material by Plasma Electrolytic Oxidation
  Abstract

The present work is aimed at the optimisation of an electrolyte system for the development of an oxide layer on Ti-6Al-4V implant material by plasma electrolytic oxidation (PEO) process, to improve its corrosion resistance under 4.5 pH osteoclast bioresorption and 7.4 pH simulated body fluid physiological conditions. All the PEO experiments were conducted for 12 min in constant current mode by a DC power supply unit with 7 different electrolyte systems consisting of methodically varied concentrations of tri-sodium ortho phosphate (Na3PO4.12H2O), sodium meta silicate (Na2SiO3.9H2O) and potassium hydroxide (KOH). The phase composition of the fabricated oxide coatings was analyzed by X-ray diffraction (XRD) technique. The morphology and thickness of the coatings were determined by scanning electron microscopy (SEM) and the corrosion characteristics were assessed by potentiodynamic polarization and electrochemical impedance spectroscopic techniques. The XRD results demonstrated that the oxide coatings mainly consisted of anatase and rutile phases with different proportions. While the average surface pore size was in the range of 3 to 6 µm, the thickness of the coating varied from 5 to 20 µm. A significant improvement in the corrosion resistance and an added capacitive nature was observed for the PEO treated Ti-6Al-4V implant material compared to that of the untreated. The variation in the proportions of anatase and rutile phases, the surface pore size distribution, the thickness of the coating and the corrosion characteristics of the developed coatings were correlated with the composition and concentration of the electrolyte system. Of the seven different electrolyte systems employed in the present study, the one consisting of 10 g Na3PO4.12H2O, 2 g Na2SiO3.9H2O and 2 g of KOH was established to be an optimized electrolyte system for developing oxide coatings on Ti-6Al-4V to minimise corrosion and thereby reduce the metal ion release under physiological conditions.

  Info
Periodical
Key Engineering Materials (Volumes 493-494)
Main Theme
Edited by
Eyup Sabri Kayali, Gultekin Goller and Ipek Akin
Pages
436-441
DOI
10.4028/www.scientific.net/KEM.493-494.436
Citation
K. Venkateswarlu, S. Suresh, N. Rameshbabu, A. C. Bose, S. Subramanian, "Effect of Electrolyte Chemistry on the Structural, Morphological and Corrosion Characteristics of Titania Films Developed on Ti-6Al-4V Implant Material by Plasma Electrolytic Oxidation", Key Engineering Materials, Vols. 493-494, pp. 436-441, 2012
Online since
October 2011
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: R. Roest, Greg Heness, Bruno A. Latella, Besim Ben-Nissan
Abstract:In the biomedical field, the surface modification of titanium aims to inhibit wear, reduce corrosion and ion release, and promote...
1307
Authors: Kai Hui Nan, G.X. Pei
Abstract:Titanium oxide films were obtained by MAO at the applied voltages of 250-550V and their bio-mineralization behavior was investigated. The...
629
Authors: Jong Ho Lee, Hyung Seon Choi, Yong Soo Jeong, Choong Soo Chi, Han Jun Oh
Abstract:The anodic titania nanotubular films for photocatalyst were synthesized by anodic oxidation in HF electrolyte, and the photocatalytic...
771
Authors: Ying Xue Yao, Li Qun Li, Jian Jun Xi
Abstract:The effect of technological parameters on MAO ceramic coating were investigated through the technique of micro-arc oxidation (MAO) on TC4...
323
Authors: Hong Yun, Chang Jian Lin, Qun Jie Xu
Chapter 14: Environmental Protection
Abstract:Anatase of TiO2films were supplied on the surface of 316L stainless steel by a sol–gel process followed by hydrothermal treatment...
2707