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Corrosion Protection of Nano-biphasic Calcium Phosphate Coating on Titanium Substrate

Author(s):

Ahlam M. Fathi, Howida S. Mandour* and Hanaa K. Abd El-Hamid   Pages 1 - 14 ( 14 )

Abstract:


Background: Increasing the bioactivity of metallic implants is necessary in biomaterial applications where hydroxyapatite (HA) is used as a surface coating. In industry, HA is currently coated by plasma spraying, but this technique has a high cost and produces coating with short-term stability.

Objectives: In the present study, electrophoretic deposition (EPD) was used to deposit nano-biphasic calcium phosphate compound (β-tri-calcium phosphate (β-TCP) /hydroxyapatite (HA)) bio-ceramics on titanium surface. The microstructural, chemical compositions and bioactivity of the β-TCP/HA coatings were studied in a simulated body fluid solution (SBF).

Methods: Scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectroscopy (EDX) and Fourier transform infrared spectroscopy (FTIR) were used. Additionally, the antibacterial effect was studied by the agar diffusion method. The corrosion behavior of the β-TCP/HA coating on titanium surface (Ti) in the SBF solution at 37 oC was investigated by means of electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization tests.

Results: The Ti surface modification increased its biocompatibility and corrosion resistance in the simulated body fluid. The antibacterial inhibition activity of the β-TCP/HA bio-ceramic was enhanced by electroless silver deposition. The enhanced properties could be attributed to the use of nano-sized biphasic calcium phosphates in a low-temperature EPD process.

Conclusions: The β-TCP/HA and β-TCP/HA/Ag coatings well protect Ti from the corrosion in SBF and endow Ti with biocompatibility. The β-TCP/HA/Ag/Ti substrate shows good antibacterial activity.

Keywords:

Corrosion, Electrophoretic coating, Tricalcium-phosphate, Hydroxyapatite, Implant, SBF solution, antibacterial activity

Affiliation:

Physical Chemistry Department, National Research Centre (NRC), Dokki, Cairo 12622, Physical Chemistry Department, National Research Centre (NRC), Dokki, Cairo 12622, Refractories, Ceramics and Building Materials Department, National Research Centre (NRC), Dokki, Cairo 12622



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