Effect of porosity on mechanical and electrochemical properties of Ti–6Al–4V alloy

Martínez, Constanza; Guerra, Carolina; Silva, Daniela; Cubillos, Mariela; Briones, Francisco; Muñoz, Lisa; Páez, Maritza; Aguilar, C.; Sancy, Mamié

doi:10.1016/j.electacta.2020.135858

Cited by 27 publications

(23 citation statements)

References 49 publications

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“…These results are in accordance with the polarization data, whose continuous potential increases with time and favors passive film formation. Thus, it is possible to observed that different shapes affect the distribution of potential and current density, as reported elsewhere 32,36 .…”

Section: Shape Effects On Corrosion Testssupporting

confidence: 67%

Surface Finishing and Shape Effects on Corrosion Resistance of Ti-6Al-4V Alloy in the Simulated Body Fluid

et al. 2022

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Pure titanium and various alloys, such as Ti-6Al-4V, are widely used as biomaterials. In this application, surface finish conditions, topography, and surface reactivity determine excellent cellular adhesion and osseointegration characteristics. The study evaluated the influence of four surface finishing treatments (sanding #120, 600, 1200, and polished with 3 µm alumina paste) and three shapes (concave, convex, and flat) on the corrosion resistance of Ti-6Al-4V at 37 °C in simulated body fluid (SBF) through potentiodynamic polarization and electrochemical impedance spectroscopy. The SBF's ionic composition allowed the formation of a stable passive layer with a low presence of pores on the surface. In addition, the combination of polished surface and convex shape showed the best electrochemical passive behavior.

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Section: Shape Effects On Corrosion Testssupporting

confidence: 67%

Surface Finishing and Shape Effects on Corrosion Resistance of Ti-6Al-4V Alloy in the Simulated Body Fluid

et al. 2022

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“…Generating a good passivation is necessary to take care of the material surface. If porosity increases, the anodization could be poorer [86]. The effect of the OH − ion is present in Ti Beta-C anodized in sulfuric acid and immersed in 3.5 wt % H 2 SO 4 solution (Figure 6a): the anodized passive layer formed is broken, and presents instability on the surface due to OH − evolution.…”

Section: Discussionmentioning

confidence: 99%

“…Current and pH affect the porosity level; as the current increases, the porosity was more significant [82]. A high porosity level is associated with high current and voltage values [85][86][87], so high current density is related to high porosity. However, a high current allows a rapid formation of the oxide layer.…”

Section: Discussionmentioning

confidence: 99%

Electrochemical Corrosion of Titanium and Titanium Alloys Anodized in H2SO4 and H3PO4 Solutions

et al. 2022

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Titanium and its alloys have superior electrochemical properties compared to other alloy systems due to the formation of a protective TiO2 film on metal surfaces. The ability to generate the protective oxide layer will depend upon the type of alloy to be used. The aim of this work was to characterize the electrochemical corrosion behavior of titanium Ti-CP2 and alloys Ti-6Al-2Sn-4Zr-2Mo, Ti-6Al-4V, and Ti Beta-C. Samples were anodized in 1 M H2SO4 and H3PO4 solutions with a current density of 0.025 A/cm2. Electrochemical tests on anodized alloys were carried out using a three-electrode cell and exposed in two electrolytes, i.e., 3.5% wt. NaCl and 3.5% wt. H2SO4 solutions at room temperature. Scanning electron microscopy (SEM) was used to observe the morphology of anodized surfaces. The electrochemical techniques used were cyclic potentiodynamic polarization (CPP) and electrochemical noise (EN), based on the ASTM-G61 and G199 standards. Regarding EN, two methods of data analysis were used: the frequency domain (power spectral density, PSD) and time-frequency domain (discrete wavelet transform). For non-anodized alloys, the results by CCP and EN indicate icorr values of ×10−6 A/cm2. However, under anodizing conditions, the icorr values vary from ×10−7 to ×10−9 A/cm2. The PSD Ψ0 values are higher for non-anodized alloys, while in anodized conditions, the values range from −138/−122 dBi (A2·Hz−1)1/2 to −131/−180 dBi (A2·Hz−1)1/2. Furthermore, the results indicated that the alloys anodized in the H3PO4 bath showed an electrochemical behavior that can be associated with a more homogeneous passive layer when exposed to the 3.5% wt. NaCl electrolyte. Alloys containing more beta-phase stabilizers formed a less homogeneous anodized layer. These alloys are widely used in aeronautical applications; thus, it is essential that these alloys have excellent corrosion performance in chloride and acid rain environments.

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“…Lucía Reig et al observed that the stiffness and bending strength of sintered porous Ti-6Al-4V samples increases with sintering time [17,18], while Jose Luis et al established that there is a polynomial relationship between Young's modulus and relative density of the sintered porous Ti alloy [19]. The negative effect of porosity on Young's modulus was also corroborated by Martínez et al [20].…”

Section: Mechanical Propertiesmentioning

confidence: 85%

Effect of particle size and sintering time on the mechanical properties of porous Ti–6Al–4V implant

2020

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Titanium alloys have been extensively used in biomedical applications owing to its low density, excellent biocompatibility (i.e., biological and chemical inertness), and unique mechanical properties. However, there is a high disparity between Young's moduli of the implant and the natural bone. This disparity causes stress shielding in the body. This paper presents the effect of particle size and sintering time of Ti-6Al-4V powder used in the formation of a porous implant, sintered at 980 °C. Morphological characteristics of the sintered samples were obtained with a scanning electron microscope. The effect of surface hydrophilicity of the samples was elucidated via surface wettability testing using contact angle measurement with bio-fluid. Mechanical characterization was also evaluated with nanoindentation and a universal testing machine. The relation between Young's modulus and sintering time was presented. It was observed that the wettability decreases with sintering time and the Ti alloy powder with particle size < 150 µm had the Young's modulus that is closer to the modulus of the bone; the optimum sintering time was 5 h.

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Effect of porosity on mechanical and electrochemical properties of Ti–6Al–4V alloy

Cited by 27 publications

References 49 publications

Surface Finishing and Shape Effects on Corrosion Resistance of Ti-6Al-4V Alloy in the Simulated Body Fluid

Surface Finishing and Shape Effects on Corrosion Resistance of Ti-6Al-4V Alloy in the Simulated Body Fluid

Electrochemical Corrosion of Titanium and Titanium Alloys Anodized in H2SO4 and H3PO4 Solutions

Effect of particle size and sintering time on the mechanical properties of porous Ti–6Al–4V implant

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