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5201 |
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Hydroxyapatite nanostructured coatings on anodized magnesium AZ31 alloy by HVOF and flame spraying |
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Hamidreza Salimijazi* / Isfahan University of Technology, Iran Marzie Mardali/ Isfahan University of Technology, Iran Fatollah Karimzadeh/ Isfahan University of Technology, Iran Reza Soltani/ University of Tehran, Iran |
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Hydroxyapatite (HA) coatings are widely used in biomaterial applications such as implants coatings. In this study, nanostructured HA coatings were used to reduce high corrosion rate of magnesium alloy (AZ31) in order to control the rate of degradation of magnesium implants. HA nanostructured powders were prepared from biological and mineral sources. Coatings were deposited on both bare and anodized AZ31 alloy substrates by high velocity oxy-fuel and flame spraying. Phase compositions, microstructures and surface morphologies were investigated using X-ray diffraction, atomic force microscopy, scanning electron microscopy and energy dispersive spectrometer (EDS) spectra. The coatings/substrates adhesion strengths were measured by pull-off test. Potentiodynamic polarization and immersion tests in simulated body fluid (SBF) were performed to measure the corrosion rate of the uncoated and coated specimens. |