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Electrophoretic Deposition of Nanostructured Hydroxyapatite Coating on Az91 Magnesium Alloy Implants With Different Surface Treatments Publisher



Rojaee R1 ; Fathi M1, 2 ; Raeissi K3
Authors
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Authors Affiliations
  1. 1. Biomaterials Research Group, Department of Materials Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran
  2. 2. Dental Materials Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
  3. 3. Department of Materials Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran

Source: Applied Surface Science Published:2013


Abstract

Bio-absorbable magnesium (Mg) based alloys have been introduced as innovative orthopedic implants during recent years. It has been specified that rapid degradation of Mg based alloys in physiological environment should be restrained in order to be utilized in orthopedic trauma fixation and vascular intervention. In this developing field of healthcare materials, micro-arc oxidation (MAO), and MgF 2 conversion coating were exploited as surface pre-treatment of AZ91 magnesium alloy to generate a nanostructured hydroxyapatite (n-HAp) coating via electrophoretic deposition (EPD) method. X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), and transmission electron microscopy (TEM) techniques were used to characterize the obtained powder and coatings. The potentiodynamic polarization tests were carried out to evaluate the corrosion behavior of the coated and uncoated specimens, and in vitro bioactivity evaluation were performed in simulated body fluid. Results revealed that the MAO/n-HAp coated AZ91 Mg alloy samples with a rough topography and lower corrosion current density leads to a lower Mg degradation rate accompanied by high bioactivity. © 2013 Elsevier B.V. All rights reserved.
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