Comparison of structural, mechanical and corrosion properties of thin TiO2/graphene hybrid systems formed on Ti-Al-V alloys in biomedical applications

The best corrosion properties (the lower value of corrosion current density) were obtained for sample Ti6Al4V coated with a TiO2(a) thin film. A deposition graphene monolayer on the top of all tested thin films improves the corrosion potential (Ecorr) value, which is much more positive than Ecorr registered for the other samples. A positive value of the corrosion potential is characteristic of materials with low electrochemical activity and thereby very good corrosion resistance. Moreover, these coatings systems maintain stability of the mechanical properties during the corrosion process.