Improvement to the Corrosion Resistance of Ti-Based Implants Using Hydrothermally Synthesized Nanostructured Anatase Coatings

被引：51
作者：
Lorenzetti, Martina [1 ,2 ]
Pellicer, Eva [3 ]
Sort, Jordi [3 ,4 ]
Dolors Baro, Maria [3 ]
Kovac, Janez [1 ]
Novak, Sasa [1 ,2 ]
Kobe, Spomenka [1 ,2 ]
机构：
[1] Jozef Stefan Inst, Dept Nanostruct Mat, Ljubljana 1000, Slovenia
[2] Jozef Stefan Int Postgrad Sch, Ljubljana 1000, Slovenia
[3] Univ Autonoma Barcelona, Dept Fis, E-08193 Bellaterra, Spain
[4] Univ Autonoma Barcelona, ICREA, E-08193 Bellaterra, Spain
来源：
MATERIALS | 2014年 / 7卷 / 01期
关键词：
titanium dioxide crystalline coating; corrosion resistance; nanomechanical behavior; biomaterials; ELECTROCHEMICAL-BEHAVIOR; TITANIUM-ALLOYS; ELASTIC-MODULUS; SURFACE; MICROSTRUCTURE; DEPOSITION; TI-6AL-4V; NANOTUBES; HARDNESS; FILMS;
D O I：
10.3390/ma7010180
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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 degrees 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.
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页码：180 / 194
页数：15
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