Corrosion resistant properties of AlN coating on the bioengineering materials

The electrochemical behavior and wettability of Aluminium nitride (AlNx) coating surface contacted with physiological solution are investigated. It is shown that the coating improves bioinertness of the metal implantation materials owing the surface energy (increasing of the wetting edge angle). The vacuum-arc deposition method is applied to form the protective coatings on the metal implantation materials. Corrosion protective properties of the coatings are shown to depend upon the AlNx synthesis conditions. Increase of nitrogen pressure above 6 · 10-4...10 · 10-4 Tor may gives rise to increase of the intrinsic stresses in the substrate - coating composition and thus to growth of its electrochemical activity. Multilayer compositions are shown to be more bioinert due to its reduced stresses level