• M. Kalisz, Motor Transport Institute,, Centre for Material Testing, Warsaw PL
• M. Grobelny, Motor Transport Institute,, Centre for Material Testing, Warsaw PL
• M. Swiniarski, Faculty of Physics, Warsaw University of Technology, Warsaw PL
• M. Mazur, Faculty of Microsystem Electronics and Photonics, Wroclaw University of Technology, Wroclaw PL
• D. Wojcieszak, Faculty of Microsystem Electronics and Photonics, Wroclaw University of Technology, Wroclaw PL
• M. Zdrojek, Faculty of Microsystem Electronics and Photonics, Wroclaw University of Technology, Wroclaw PL
• J. Judek, Faculty of Microsystem Electronics and Photonics, Wroclaw University of Technology, Wroclaw PL
• J. Domaradzki, Faculty of Microsystem Electronics and Photonics, Wroclaw University of Technology, Wroclaw PL
• D. Kaczmarek, Faculty of Microsystem Electronics and Photonics, Wroclaw University of Technology, Wroclaw PL

In this paper the comparative studies on mechanical and corrosion properties of hybrid coating systems based on titanium dioxide thin films (200 nm) and graphene monolayer, have been investigated. The pure titanium dioxide layers were deposited on Ti6Al4V alloy surface using conventional magnetron sputtering process and so-called “magnetron sputtering with modulated plasma” process. Graphene monolayer was transferred on titanium alloy substrate using “PMMAmediated” method. The structural characteristics of obtained thin films were examined by using of Raman spectroscopy, XRD (x-ray diffraction), SEM (scanning electron microscope) and AFM (atomic force microscopy) measurement. The mechanical properties i.e.: nanohardness, was performed by using nanoindenter test. Corrosion properties of the coatings was determined by analysis of the voltammetric curves. The deposited TiO₂ thin film prepared by conventional magnetron sputtering process consisted of visible grains, and had nannocrystalline anatase phase (TiO₂(a)). The TiO₂ thin film deposited by plasma modulated sputtering consisted from big, irregular grains and its surface was not as homogenous as for the coating prepared by conventional method (TiO₂(r)). The hardness of TiO₂(a) and TiO₂(r) thin films was equal: 7.59 GPa and 14.2 GPa, respectively. Grapene transferred on titanium dioxide thin films surface was a single layer without defects. Unfortunately, graphene monolayer has no affect on surface hardness of titanium dioxide thin films and can be very easily removed from the surface. The best corrosion properties (the lower value of corrosion current density) was obtained for sample Ti6Al4V coated with TiO₂(a) thin film. Deposition graphene monolayer on the top of all tested thin films, improves corrosion potential value, which is much more positive than E_corr registered for the other samples. A positive value of the corrosion potential is characteristic for materials with low electrochemical activity and thereby very good corrosion resistance.

DOI:  dx.doi.org/10.14332/svc15.proc.1962

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