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An in vitro study of Ti and Ti-alloys coated with sol–gel derived hydroxyapatite coatings

Electrochemical–corrosion properties of Ti, Ti6Al6Nb and Ti6Al4V implant materials coated with calcium phosphate (CaP) coatings were investigated in vitro at the open circuit potential using non-destructive electrochemical impedance spectroscopy (EIS) technique in simulated physiological-Hank's...

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Published in:Surface & coatings technology 2003-02, Vol.165 (1), p.40-50
Main Authors: Metikoš-Huković, M, Tkalčec, E, Kwokal, A, Piljac, J
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Language:English
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cited_by cdi_FETCH-LOGICAL-c368t-7a68dd8531ff130ab34145d51e8158e2f446649ec78b7570eba69e2939ebeaf73
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description Electrochemical–corrosion properties of Ti, Ti6Al6Nb and Ti6Al4V implant materials coated with calcium phosphate (CaP) coatings were investigated in vitro at the open circuit potential using non-destructive electrochemical impedance spectroscopy (EIS) technique in simulated physiological-Hank's Balanced Salt Solution (HBSS). Characterization of the structure and composition of CaP coatings obtained by the sol–gel method was performed using X-ray diffraction analysis. The interpretation of the EIS results was based upon a two-layer model of the surface film consisting of an inner barrier TiO 2 (CaTiO 3) layer and the outer porous hydroxyapatite (HAP)+β-tricalcium phosphate (β-TCP) layer, described by using the high frequency time constant (τ 1 HF) and the low frequency time constant (τ 2 LF), respectively. Spontaneously passivated surfaces of naturally grown surface films on all three substrates in HBSS were used for reference. The chemical composition of the substrate as well as the composition and crystallinity of the CaP coating have a direct influence on electrochemical–corrosion properties of the implant materials under in vitro conditions. Well-crystallized HAP and β-TCP exhibited a beneficial corrosion protection effect on the substrate during prolonged exposure to HBSS. In the case of poorly crystallized coatings containing a greater amount of carbonate incorporated in the structure of HAP, the total impedance of the system markedly changed with prolonged exposure to physiological solution due to degradation of the coating.
doi_str_mv 10.1016/S0257-8972(02)00732-6
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identifier ISSN: 0257-8972
ispartof Surface & coatings technology, 2003-02, Vol.165 (1), p.40-50
issn 0257-8972
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language eng
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source ScienceDirect Freedom Collection 2022-2024
subjects Applied sciences
Coatings for biomedical applications
Corrosion
Corrosion environments
Exact sciences and technology
Impedance spectroscopy
Metals. Metallurgy
Slurry
Sol–gel
Titanium
Titanium alloy
X-Ray diffraction
title An in vitro study of Ti and Ti-alloys coated with sol–gel derived hydroxyapatite coatings
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