Hydroxyapatite (HAP) coatings were deposited on 316L stainless steel by the sol-gel method. The same technique was used also for deposition HAP coatings onto stainless steel substrates coated previously with carbon film by RF PACVD method. The HAP coatings were annealed in air at the temperature of 500^oC and 700^oC. Their morphology, chemical and crystalline structure were characterized using scanning electron microscopy , energy dispersive x-ray spectroscopy, Fourier transform infrared spectroscopy and X-ray diffraction. The protective properties of the coatings were investigated by means of electrochemical tests which were carried out in Tyrode’s solution.

It was found that both carbon and HAP coating improved corrosion resistance of stainless steel substrate. Protective properties of composite carbon-HAP coating depended on the temperature of heat treatment. The composite coating annealed at 500^oC revealed better protective properties than that treated at 700^oC.

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1. Protective properties of composite oxide coatings deposited by sol‑gel method
2. Adhesion of composite carbon-hydroxyapatite coatings deposited on 316L stainless steel