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

Abstract

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.

Mechanical and electrochemical properties of Nb2O5, Nb2O5:Cu and graphene layers deposited on titanium alloy (Ti6Al4V)

“…The described above corrosion mechanism causes destruction of the TiO 2 film passivity and loss of mechanical properties [7].…”

The Sustainable Improvement of Manufacturing for Nano-Titanium

“…Specific solution directions for the research are proposed as below: (1) Enable each part of the system to meet optimal conditions (2) Pre-arrange the object or system at the most convenient time and place (3) Make all parts of an object or system work at full load (4) Introduce electric, magnetic fields to interact with an object or system (5) Restore consumable or degradable parts of an object or system during operation (6) Change the degree of flexibility Combining these solution directions, specific solution directions for the research are proposed as below:…”

“…The solution is to put the pressing mold heating resistance wires into the furnace and then simultaneously heat the pressing mold and the titanium samples. (2) Changing the degree of flexibility in the process, the ECAP process uses cold rolling to achieve the refined grain structure and high mechanical properties for the Titanium.…”

“…Therefore, lots of researchers pay attention to using titanium for medical applications. Lorenzetti et al [2] focused on improving the corrosion resistance of titanium. The overall results indicated that the hydrothermally prepared anatase coatings had appropriate morphology and surface properties for using in medical devices.…”

Enhanced osteogenesis on titanium implants by UVB photofunctionalization of hydrothermally grown TiO2 coatings

“…However, the prominent role of either the surface photo-induced hydrophilicity or the photolysis by UVC, in respect to the bioactivity, is still controversial in literature. In our previous works 17,18 it was shown that hydrothermally grown TiO 2 -coatings provided advantageous surface characteristics, without affecting the bulk mechanical properties of the substrates; specifically, the HT coatings were made of firmly attached anatase nanocrystals, which provided higher corrosion-resistance, surface nanoroughness and a more hydrophilic nature than the bare titanium. All these features are expected to positively influence the biological response towards the coated titanium.…”