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Metallic implants have been successfully used in medicine for the past 60–70 years. Historically, implants were designed only as mechanical devices, whereas the biological aspects of their application were beyond the researchers’ interest. The improvement of living conditions and the increase of the average life span have changed the situation. The clinical requirements for medical implants rise up substantially. Presently, it seems impossible to imagine the use of metallic implants in the human body without preliminary surface modification to modulate the interaction between the surrounding biological environment and the implant. The review highlights the most recent advances in the field of functional coatings formed on implants by the plasma electrolytic oxidation technology. Special attention is dedicated to the principles of surface modification of the commercially pure titanium, titanium nickelide, and Mg-Mn-Ce magnesium alloy. The advantages and disadvantages of the method and the characteristics of these materials are discussed from this point of view. Some aspects of this review are aimed at corrosion protection of implants with application of polymer materials.

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The aim of the present work was to examine the effect of the plasma electrolytic oxidation (PEO) process on the mechanical properties of nitinol. The comparative evaluation of the microhardness and elastic modulus of the nitinol alloy and the PEO coating was carried out.The analysis of the obtained data confirmed closeness of the microhardness and elastic modulus with the respective values for nitinol layers adjacent to the coating. The reason for such a transformation on the boundary with the coating layers of nitinol could consist in the alloy amorphism as a result of the microsecond high temperature plasma influence occurring under PEO conditions and followed by sharp material cooling after attenuation of the plasma microdischarge. Unlike the thermal air oxidation (as a result, the hardness and fragility of the titanium alloy surface layers increase sharply), the changes described above facilitate increase of the mechanical and corrosion mechanical strength of the processed sample.

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