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

Materials

Martina Lorenzetti¹  Eva Pellicer³  Jordi Sort²  Maria Dolors Baró³  Janez Kovač¹  Saᘚ Novak¹ 

[1] Department for Nanostructured Materials, Jožef Stefan Institute, Jamova cesta 39, Ljubljana 1000, Slovenia; E-Mails:;Institució Catalana de Recerca i Estudis Avançats (ICREA) and Departament de Física, Universitat Autònoma de Barcelona, Bellaterra E-08193, Spain; E-Mail:;Departament de Física, Universitat Autònoma de Barcelona, Bellaterra E-08193, Spain; E-Mail:

关键词: titanium dioxide crystalline coating;    corrosion resistance;    nanomechanical behavior;    biomaterials;   

DOI  :  10.3390/ma7010180

来源: mdpi

【 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 °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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland