Abstract
Hydroxyapatite (HAp) coatings were prepared on Ti6Al4V substrate by electrodeposition method from electrolyte solution containing Ca(NO3)2, NH4H2PO4 and NaNO3. The results show that the HAp coatings were single phase crystals of HAp. Scanning electron microscope (SEM) images present that HAp/Ti6Al4V have flake shapes which arrange to form like-coral agglomerates. In vitro test of the Ti6Al4V and HAp/Ti6Al4V in simulated body fluid (SBF) solution was investigated with different immersion times. pH of SBF solution decreased and the mass of materials increased. SEM images prove the formation of apatite on the surface of Ti6Al4V and HAp/Ti6Al4V. The corrosion current density during immersion time of substrate is always higher than the one of HAp/Ti6Al4V because the deposited HAp can protect well for the substrate.
Highlights
In humans and mammals, hydroxyapatite (HAp, Ca10(PO4)6(OH)2) is the main component of bone and teeth
The HAp coatings were electrodeposited on Ti6Al4V biometallic alloy with the elemental compositions given in table 1
HAp coatings were lightly separated from the substrate and the phase structure of HAp coatings were characterized by x-ray diffraction (XRD) (Siemen D5005 Bruker-Germany, Cu-Kα radiation (λ = 1.5406 Å)), operated at 40 kV and 30 mA, with step angle of 0.030° s−1 and in a 2θ degree range of 20°–50°
Summary
Hydroxyapatite (HAp, Ca10(PO4)6(OH)2) is the main component of bone and teeth. Synthetic HAp has similar chemical composition, crystal structure and high biocompatibility as the natural bone tissue [1, 2]. Exploiting the biocompatibility of HAp in the fabrication of bone and tooth implants it was coated on metal or alloy: Ti, 316L stainless steel, CoCrMoNi, TiN, TiO2, Ti6Al4V etc. Ti6Al4V is a common metallic alloy which has found many uses as biomaterials in the human body. It has been increasingly preferred in the biomedical arena with cardiovascular, dental and orthopedic applications because of their properties. To improve osteo-integration with bone tissues, many researchers synthesized HAp coatings on the surface of metals or alloys. In this work we electrodeposited HAp coatings on Ti6Al4V with the variation of scanning potential range and scan number.
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