TY - JOUR
T1 - Improvement to the corrosion resistance of Ti-based implants using hydrothermally synthesized nanostructured anatase coatings
AU - Lorenzetti, Martina
AU - Pellicer, Eva
AU - Sort, Jordi
AU - Baró, Maria Dolors
AU - Kovač, Janez
AU - Novak, Saša
AU - Kobe, Spomenka
PY - 2014/2/12
Y1 - 2014/2/12
N2 - The electrochemical behavior of polycrystalline TiO2 anatase coatings prepared by a one-step hydrothermal synthesis on commercially pure (CP) Ti grade 2 and a Ti13Nb13Zr alloy for bone implants was investigated in Hank's solution at 37.5 °C. The aim was to verify to what extent the in-situ-grown anatase improved the behavior of the substrate in comparison to the bare substrates. Tafel-plot extrapolations from the potentiodynamic curves revealed a substantial improvement in the corrosion potentials for the anatase coatings. Moreover, the coatings grown on titanium also exhibited lower corrosion-current densities, indicating a longer survival of the implant. The results were explained by considering the effects of crystal morphology, coating thickness and porosity. Evidence for the existing porosity was obtained from corrosion and nano-indentation tests. The overall results indicated that the hydrothermally prepared anatase coatings, with the appropriate morphology and surface properties, have attractive prospects for use in medical devices, since better corrosion protection of the implant can be expected. © 2014 by the authors; licensee MDPI, Basel, Switzerland.
AB - The electrochemical behavior of polycrystalline TiO2 anatase coatings prepared by a one-step hydrothermal synthesis on commercially pure (CP) Ti grade 2 and a Ti13Nb13Zr alloy for bone implants was investigated in Hank's solution at 37.5 °C. The aim was to verify to what extent the in-situ-grown anatase improved the behavior of the substrate in comparison to the bare substrates. Tafel-plot extrapolations from the potentiodynamic curves revealed a substantial improvement in the corrosion potentials for the anatase coatings. Moreover, the coatings grown on titanium also exhibited lower corrosion-current densities, indicating a longer survival of the implant. The results were explained by considering the effects of crystal morphology, coating thickness and porosity. Evidence for the existing porosity was obtained from corrosion and nano-indentation tests. The overall results indicated that the hydrothermally prepared anatase coatings, with the appropriate morphology and surface properties, have attractive prospects for use in medical devices, since better corrosion protection of the implant can be expected. © 2014 by the authors; licensee MDPI, Basel, Switzerland.
KW - Biomaterials
KW - Corrosion resistance
KW - Nanomechanical behavior
KW - Titanium dioxide crystalline coating
U2 - https://doi.org/10.3390/ma7010180
DO - https://doi.org/10.3390/ma7010180
M3 - Article
SN - 1996-1944
VL - 7
SP - 180
EP - 194
JO - Materials
JF - Materials
ER -