Study of Corrosion-Resistance on Biomedical Coating by Different Surface Treatments

Abstract

The porous titanium alloy prepared by gel-casting methods was used as precursor and the composite coatings with hydroxyapatite HA/TiO2were prepared on the precursor which was treated by NaOH solution, H2O2+ NH3solution, HF+HNO3, PdCl2solution to improve the capability of coatings. The microstructure was examined by SEM and the corrosion behavior of the coating layers in the simulated body fluids (SBF) was evaluated by potentiodynamic polarization test and impedance plots. The results show that the corrosion resistance of samples using PdCl2treatment is superior to else others. The PdCl2processing provides the substrate surface an excellent oxide film, which plays a key role in the corrosion resistance of coating. The thickness of the coatings is about 60μm and the surface morphologies are more uniform than the others and have no crack.

Preparation of HA/TiO2 biological coating on titanium alloy

“…It can be used in the manufacture of medical apparatus and instruments, prosthesis and auxiliary treatment equipment etc., which is one of the widely used metal implant materials [5][6]. HA coated to titanium alloy surface not only has a good biological activity, but excellent mechanical properties of titanium alloy substrate and good biological properties of HA ceramics, which has become a hot topic of current biomedical materials research [7][8].…”