Preparation and Characterization of HA/ZrO2 Biocomposite Coating on 316 Stainless Steel Fabricated by Electrodeposition

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Shojaee, Peyman | 2014

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 45819 (07)
University: Sharif University of Technology
Department: Materials Science and Engineering
Advisor(s): Afshar, Abdollah
Abstract:
In this research, role of zirconia nanoparticles as a biocompatible material which has great mechanical properties, was investigated on corrosion behavior and bonding strength of HA coating. HA- ZrO2 composite prepared by a 2-step pulse electrodeposition method. Effect of pH (3.5, 4.5), bath temperature (60, 80 ͦC), current density (0.5, 1, 2 mA/cm2) and zirconia concentration (5, 10, 15 g/L) on coating characteristics were studied. X-ray diffraction was employed for phase analysis. Morphology and microstructure of samples observed utilizing scanning electron microscope (SEM) and elemental analysis was done by EDS. In order to corrosion studies electrochemical impedance spectroscopy (EIS) and polarization test were performed at 37 ͦC in simulated body fluid (SBF).Biocompatibility of coatings evaluated by immersing the samples in SBF at 37 ͦC for 1 month. Optimized HA deposit achieved at pH=4.5, T=80 ͦC and current density of 1 mA/cm2. Electrochemical tests showed that presence of zirconia decreases corrosion current density from 0.173 to 0.031 μA/cm2 and also increases polarization resistance from 70 to 131 kΩ. Bonding strength of HA- ZrO2 composite in favorable condition was 12 MPa
Keywords:
Zirconia ; Hydroxyapatite ; Bioceramic ; 316 Austenitic Stainless Steel

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