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Effect of Fluorine Addition on Properties of Electrodeposited Fluorine-doped Hydroxyapatite Coating on AZ31 alloy

Amirloo, Hossein | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44740 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Afshar, Abdollah
  7. Abstract:
  8. Magnesium and its alloys are potentialy biodegradable implant materials due to their attractive biological properties. But their poor corrosion resistance may result in sudden failure of the implants. Recently, many researchers have focused on applications of fluorine-doped hydroxyapatiteCa10(PO4)6(OH)2−xFx (FHA, x is the degree of fluoridation) as a bioactive coating to provide early stability and long-term performance. In comparison with pure HA coating,FHA coating could provide significant dissolution-resistant property, better apatite-like layer deposition, better protein adsorption, better cell attachment and improved alkaline phosphatase activity in cell culture. In this studyfluorine-doped hydroxyapatite prepared on AZ31 alloy substrate by pulse electrodeposition in one step. Structural properties of the coatings were characterized by X-ray diffractometer with Cu Kα . Electrochemical measurements were carried out in artficial saliva (AS) at 37 ◦C and pH=4.5 Morphology of the coatings was analyzed with SEM and chemical composition and atomic ratio of the Ca , F and P was investigated with EDS andFT-IR test was carried out for studing chemical bands of the coating . Effective parameters on coating morphology are pH, tempature and NaF concentration. The optimized coatinghavecolumnar nanostructure (70-100 nanometer in diameter) and preferred orientation of (002). This coating is dense, uniformand provides improved corrosion resistance up to 1000 times.Adhesive strength of coatingswith optimized corrosion resistance was 41.32 Mpa. Ca/Pratio of the coatings are in range of 1.34-1.59
  9. Keywords:
  10. Coating ; Dental Implant ; AZ31 Magnesium Alloy ; Bioceramic ; Artificia Saliva ; Fluorine-Doped Hydroxyapatite (FHA) ; Bone Implant

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