hrvatski

Corrosion resistance of titanium based biomedical implant materials

The main goal of this study was to examine the effect of calcium phosphate coating (CaP coating) on the corrosion resistance of titanium alloy, Ti– 6Al–7Nb, commercially used as an implant material in orthopedic devices. In addition to enabling osseointegration, the CaP coating forms a kinetic barrier to the electrochemical corrosion reaction, thus protecting the material from corrosion- induced degradation. This further increases the biocompatibility of the implant material. The CaP coating was deposited to the Ti–6Al–7Nb alloy by the electrochemical cathodic deposition method. Electrodeposition of the calcium phosphate film was performed from an aqueous solution of Ca(NO3)2 and NH4H2PO4 salts and film formation parameters were investigated using cyclic voltammetry (CV). Electrochemical characterization of the Ti–6Al–7Nb alloy in simulated body fluid, Hank’s solution was performed before and after the surface modification. The following electrochemical experimental techniques were used: electrochemical impedance spectroscopy (EIS) and linear polarization (LP) in the narrow (±20 mV vs. open circuit potential) and in the wide (±200 mV vs. open circuit potential) potential range at a scan rate of 0.1667 mV/s. The morphology and microstructure of CaP deposit obtained was characterized by scanning electron microscopy (SEM) and chemical composition was assessed by attenuated total reflection Fourier-transform infrared spectroscopy (ATR-FTIR).

corrosion resistance ; titanium ; implant materials

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