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

M. Kalisz , M. Grobelny , Michał Świniarski , M. Mazur , D. Wojcieszak , Mariusz Zdrojek , Jarosław Judek , J. Domaradzki , D. Kaczmarek

Abstract

In this paper, comparative studies on the mechanical and corrosion properties of hybrid coating systems based on titanium dioxide thin films (200. nm) and graphene monolayers have been investigated. The pure titanium dioxide layers were deposited on a Ti6Al4V alloy surface using the conventional magnetron sputtering process and the so-called "magnetron sputtering with modulated plasma" process. A graphene monolayer was transferred to a titanium alloy substrate using the "PMMA-mediated" method. The structural characteristics of the obtained thin films were examined by using Raman spectroscopy, X-ray diffraction (XRD), a scanning electron microscope (SEM) and atomic force microscopy (AFM) measurement. The mechanical properties, i.e. hardness, were tested by using a nanoindenter test. The corrosion properties of the coatings were determined by analysis of the voltammetric curves.The deposited TiO2 thin film prepared by the conventional magnetron sputtering process consisted of visible grains with the size of ca. 50-100nm and had a nanocrystalline anatase phase (TiO2(a)). The TiO2 thin film deposited by plasma-modulated sputtering had a nanocrystalline rutile structure TiO2(r) and its surface consisted of big, irregular grains and was not as homogeneous as the coating prepared by the conventional method.The hardness of TiO2(a) and TiO2(r) thin films was equal: 7.59GPa and 14.2GPa, respectively.Graphene transferred to a titanium dioxide thin film surface was a single layer without defects. Unfortunately, the nanoindentation method, used to measure the hardness of the titanium dioxide/graphene coating systems, is not sensitive to one or few atomic layers of graphene deposited on the top of the coating structures. Therefore, the measurement did not reveal changes of titanium dioxide thin film hardness after graphene deposition, in comparison with uncoated TiO2 thin films such as TiO2(a) and TiO2(r) thin films. Futhermore, the graphene monolayer can be very easily removed from the titanium dioxide thin film surface (e.g. by scratching).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. © 2015 Elsevier B.V.
Author M. Kalisz
M. Kalisz,,
-
, M. Grobelny
M. Grobelny,,
-
, Michał Świniarski ZBS
Michał Świniarski,,
- Structural Research Division
, M. Mazur
M. Mazur,,
-
, D. Wojcieszak
D. Wojcieszak,,
-
, Mariusz Zdrojek ZBS
Mariusz Zdrojek,,
- Structural Research Division
, Jarosław Judek ZBS
Jarosław Judek,,
- Structural Research Division
, J. Domaradzki
J. Domaradzki,,
-
, D. Kaczmarek
D. Kaczmarek,,
-
Journal seriesSurface Coatings Technology, ISSN 0257-8972
Issue year2016
Vol290
Pages124-134
Publication size in sheets0.5
Keywords in EnglishAtomic force microscopy; Coatings; Corrosion; Corrosion resistance; Deposition; Electrochemical properties; Film preparation; Graphene; Hardness; Hybrid systems; Magnetron sputtering; Mechanical properties; Medical applications; Monolayers; Nanocrystals; Nanoindentation; Oxide minerals; Oxides; Scanning electron microscopy; Structural properties; Surface defects; Titanium; Titanium alloys; Titanium dioxide; X ray diffraction, Characteristic of materials; Conventional magnetron sputtering; Corrosion current densities; Electrochemical activities; Mechanical and corrosion properties; Nano-indentation methods; Structural characteristics; Titanium dioxide thin film, Thin films
DOIDOI:10.1016/j.surfcoat.2015.08.011
URL http://www.scopus.com/inward/record.url?eid=2-s2.0-84939826336&partnerID=40&md5=8ec2d91c9d90e5e2e0e490707ebc253a
Languageen angielski
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kalisz2015sct.pdf 3.85 MB
Score (nominal)35
ScoreMinisterial score = 35.0, 28-11-2017, ArticleFromJournal
Ministerial score (2013-2016) = 35.0, 28-11-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 2.589 (2) - 2016=2.538 (5)
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