engleski

An EIS Study of Nanostructured Biocompatible Hydroxyapatite Coatings on Titanium Alloys

The concept of coating metal implant surface with multilayered nanostructures of hydroxyapatite bioceramic films combines the mechanical benefits of alloys with biocompatible properties of the coating. Titanium, Ti6Al6Nb and Ti6Al4V substrates were coated by the sol-gel technique using calcium 2-ethylhexanoate and 2-ethyl-hexyl-phosphate as calcium and phosphorus precursors, respectively. The coatings were characterized by the x-ray diffraction technique. The dielectric properties of CaP coatings and their influence on chemical and corrosion stability of the substrate material were investigated in simulated physiological solution using nondestructive impedance spectroscopy technique. After prolongoued exposure to physiological solution, due to disintegration of the coating, the properties of substrate material became pronounced with the following order of decreasing resistance to corrosion: Ti6Al6Nb > Ti > Ti6Al4V. The results were compared with the results of spontaneously formed coatings on titanium and titanium alloys.

Hydroxyapatite; Titanium

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