Table 1.
Groups for testing corrosion in SBF as a function of the concentrations of dextrose (DEX), lipopolysaccharide (LPS), and the association of LPS and dextrose (DEXLPS) (n = 3).
Figure 1.
Representative cyclic potentiodynamic polarization curve of Ti-6Al-4V alloy.
Tests were conducted in simulated body fluid - SBF (control) with different concentrations of dextrose (DEX), lipopolysaccharide (LPS), and combinations of dextrose and lipopolysaccharide (DEXLPS).
Figure 2.
Electrochemical data of cyclic potentiodynamic polarization curve.
Mean and standard deviation of corrosion potential (Ecorr), corrosion current density (Icorr), and the passivation current density (Ipass) for the Ti-6Al-4V alloys with a smooth surface and etched with acid, in SBF with different concentrations of dextrose (DEX) and lipopolysaccharide (LPS), alone or in combination (DEXLPS). * Denotes significant correlation at the 0.05 level.
Figure 3.
Electrochemical impedance spectroscopy (EIS) represented by the Bode plot of the Ti-6Al-4V alloy.
Tests were conducted in simulated body fluid - SBF (control) with different concentrations of dextrose (DEX), lipopolysaccharide (LPS), and combinations of dextrose and lipopolysaccharide (DEXLPS).
Figure 4.
Electrochemical impedance spectroscopy (EIS) represented by the Nyquist plot of the Ti-6Al-4V alloy.
Tests were conducted in simulated body fluid - SBF (control) with different concentrations of dextrose (DEX), lipopolysaccharide (LPS), and combinations of dextrose and lipopolysaccharide (DEXLPS).
Figure 5.
Electrochemical data from the EIS test.
Means and standard deviations of polarization resistance (Rp) and capacitance (Cdl) for the Ti-6Al-4V alloys with a smooth surface and etched with acid in SBF with different concentrations of dextrose (DEX) and lipopolysaccharide (LPS), alone or in combination (DEXLPS). * Denotes significant correlation at the 0.05 level.
Table 2.
Correlations between parameters of corrosion, roughness, and hardness with concentrations of dextrose (DEX) and lipopolysaccharide (LPS) (used alone or together) for Ti-6Al-4V alloys with smooth surfaces and conditioned with double-acid-etching.
Table 3.
Comparisons (independent t-test) between the Ti-6Al-4V alloys with smooth surfaces and double-acid-etching parameters for corrosion, roughness, and microhardness.
Figure 6.
Means and standard deviations of surface roughness (Ra) (in nm) and Vickers microhardness for the Ti-6Al-4V alloys with a smooth surface and those etched with acid in SBF with different concentrations of dextrose (DEX) and lipopolysaccharide (LPS), alone or in combination (DEXLPS). * Denotes significant correlation at the 0.05 level.
Figure 7.
Scanning electron microscope images (300× and 10,000×) of the Ti-6Al-4V alloy with smooth surface,
showing the Ti-6Al-4V alloy surface before and after corrosion in SBF (control - Co) with different concentrations of dextrose (DEX) and lipopolysaccharide (LPS), alone or in combination (DEXLPS). WD = 8 mm; 15 Kv.
Figure 8.
Scanning electron microscope images (300× and 10,000×) of the Ti-6Al-4V alloy with acid-etched surface,
showing the Ti-6Al-4V alloy surface before and after corrosion in SBF (control - Co) with different concentrations of dextrose (DEX) and lipopolysaccharide (LPS), alone or in combination (DEXLPS). WD = 8 mm; 15 Kv.
Figure 9.
Representative energy-dispersive spectroscopy (EDS).
(a) Ti-6Al-4V alloy with smooth surface before corrosion test. (b) Ti-6Al-4V alloy with smooth surface after the corrosion test. (c) Ti-6Al-4V with acid-etched surface before the corrosion test. (d) Ti-6Al-4V with acid-etched surface after the corrosion test.
Figure 10.
3D AFM images of a Ti-6Al-4V alloy with a smooth surface.
Surfaces were characterized before (baseline) and after corrosion in SBF (control) with different concentrations of dextrose (DEX) and lipopolysaccharide (LPS), alone or in combination (DEXLPS).
Figure 11.
3D AFM images of the Ti-6Al-4V alloy with an acid-etched surface.
Surfaces were characterized before (baseline) and after corrosion in SBF (control) with different concentrations of dextrose (DEX) and lipopolysaccharide (LPS), alone or in association (DEXLPS).