TY - JOUR
T1 - Incorporation of Ca and P on anodized titanium surface
T2 - Effect of high current density
AU - Laurindo, Carlos A.H.
AU - Torres, Ricardo D.
AU - Mali, Sachin A.
AU - Gilbert, Jeremy L.
AU - Soares, Paulo
N1 - Funding Information:
This work was partially financed by CNPq (Edital MCT/CNPq Nº 62/2008 Proc. 577445/2008 ). C.A.H. Laurindo gratefully acknowledges the fellowship from the CAPES (PDSE Proc. 9274/12-0). The authors also acknowledge the Syracuse Biomaterials Institute (SBI) for the use of its facilities to conduct corrosion tests.
PY - 2014/4/1
Y1 - 2014/4/1
N2 - This study systematically evaluated the surface and corrosion characteristics of commercially pure titanium (grade 2) modified by plasma electrolytic oxidation (PEO) with high current density. The anodization process was carried out galvanostatically (constant current density) using a solution containing calcium glycerophosphate (0.02 mol/L) and calcium acetate (0.15 mol/L). The current densities applied were 400, 700, 1000 and 1200 mA/cm 2 for a period of 15 s. Composition, crystalline structure, morphology, roughness, wettability and "in-vitro" bioactivity test in SBF of the anodized layer were evaluated by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, profilometry and contact angle measurements. Corrosion properties were evaluated by open circuit potential, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization measurements. The results show that the TiO2 oxide layers present an increase of thickness, porosity, roughness, wettability, Ca/P ratio, and bioactivity, with the applied current density up to 1000 mA/cm2. Corrosion resistance also increases with applied current density. It is observed that for 1200 mA/cm2, there is a degradation of the oxide layer. In general, the results suggest that the anodized TiO2 layer with better properties is formed with an applied current of 1000 mA/cm2.
AB - This study systematically evaluated the surface and corrosion characteristics of commercially pure titanium (grade 2) modified by plasma electrolytic oxidation (PEO) with high current density. The anodization process was carried out galvanostatically (constant current density) using a solution containing calcium glycerophosphate (0.02 mol/L) and calcium acetate (0.15 mol/L). The current densities applied were 400, 700, 1000 and 1200 mA/cm 2 for a period of 15 s. Composition, crystalline structure, morphology, roughness, wettability and "in-vitro" bioactivity test in SBF of the anodized layer were evaluated by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, profilometry and contact angle measurements. Corrosion properties were evaluated by open circuit potential, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization measurements. The results show that the TiO2 oxide layers present an increase of thickness, porosity, roughness, wettability, Ca/P ratio, and bioactivity, with the applied current density up to 1000 mA/cm2. Corrosion resistance also increases with applied current density. It is observed that for 1200 mA/cm2, there is a degradation of the oxide layer. In general, the results suggest that the anodized TiO2 layer with better properties is formed with an applied current of 1000 mA/cm2.
KW - Bioactivity
KW - Corrosion
KW - Implants
KW - Plasma electrolytic oxidation
KW - Titanium
KW - Wettability
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U2 - 10.1016/j.msec.2014.01.006
DO - 10.1016/j.msec.2014.01.006
M3 - Article
C2 - 24582243
AN - SCOPUS:84893063304
SN - 0928-4931
VL - 37
SP - 223
EP - 231
JO - Materials Science and Engineering C
JF - Materials Science and Engineering C
IS - 1
ER -