Evaluation of the influence of texture and microstructure of titanium substrates on TiO2 anodic coatings at 60 V

Vera, María L.; Ávalos, Martina; Rosenberger, Mario Roberto; Bolmaro, R.E.; Schvezov, Carlos Enrique; Ares, Alicia Esther

doi:10.1016/j.matchar.2017.07.005

Cited by 6 publications

(4 citation statements)

References 27 publications

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“…Whereas, on regions rich in b, a phase lamellar structure was observed. This phenomenon was already described from previous research [26], and different morphologies were also observed in reports for nanotubes grown on biphasic (a + b) alloys [16,[23][24][25]. Luz et al [26] showed the first results about nanotubes grew on Ti-Nb alloy surface.…”

Section: Resultssupporting

confidence: 71%

“…Different factors and their influence on nanotubes have been investigated with details, such as pH, fluoride content, ageing of the electrolyte, anodizing potential and time, current density and temperature; which were summarized by several review [10]. Some authors investigated the effect of Ti crystalline orientation/ microstructure on morphology nanotubes [11][12][13][14][15][16][17] and others for porous films obtained by anodic process [18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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Characterization of the morphology, structure and wettability of phase dependent lamellar and nanotube oxides on anodized Ti-10Nb alloy

Luz

Santos

Lepienski

et al. 2018

Applied Surface Science

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Nanotubes grown on Ti and its alloys have been extensively investigated for the biomaterials applications, since these structures improve the surface biocompatibility and the corrosion resistance due to oxide formation. Some researchers showed that the microstructure of the pure Ti affect the morphology of nanotubes grown by anodic process. However, this subject is rarely investigated for nanotubes grown on Ti alloys. In the same way, nanostructured films formed by concomitant regions of tubes and lamellar structures hardly ever were reported. Investigations concerning these topics are required once beta titanium alloys are suitable candidates to replace the pure Ti and Ti-Al-V alloys for biomedical applications. Beta alloys composed of non-toxic elements (Nb, Ta, Mo) are biocompatible and have an excellent mechanical properties and corrosion resistance. The present work investigated questions regarding to the effect of microstructure of Ti-10Nb alloy on morphology of nanostructured film growth by anodization. The morphology, thickness, composition and atomic arrangement (amorphous/crystalline) of formed oxides, and the contact angle of anodic film were investigated. The X-ray diffraction patterns and SEM image show that the Ti-10Nb alloy is composed by alpha (hcp) and beta (bcc) phases. SEM and TEM techniques revel that self-organized nanotubes grew on alpha phase, whereas a lamellar structure with transversal holes grew on b-phase. Crystalline oxides are formed at oxide-metal interface, as indicated by X-ray diffraction patterns. However, the tubes and lamellas grown over the compact oxide are amorphous, as-prepared and annealed at 230°C for 3 h, as showed by SAED patterns. The nanostructured films annealed at 430°C and at 530°C were damaged. A few changes were observed in XRD patterns of film annealed at 230°C while the morphology held similar as the unannealed film. Finally, the presence of phosphorus ions incorporated into the anodic layer makes the surface hydrophilic, since a similar nanostructured film without phosphorous incorporation results hydrophobic.

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Section: Resultssupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Characterization of the morphology, structure and wettability of phase dependent lamellar and nanotube oxides on anodized Ti-10Nb alloy

Luz

Santos

Lepienski

et al. 2018

Applied Surface Science

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“…In the same way as in anodizing processes, the thickness of the modified layer subjected to oxidation is shown as one of the main parameters that affects the chromatic variation of the material [25]. In this aspect, in accordance with Perez del Pino et al [15,16], it has been detected that, for treatments that involve higher thicknesses of modified layers corresponding to lower E d and V s , there is a tendency towards bluish and grayish to dark brown color tonalities.…”

Section: Laser Textured Specimens: Chromatic Variabilitysupporting

confidence: 55%

Effects of Laser Processing Parameters on Texturized Layer Development and Surface Features of Ti6Al4V Alloy Samples

Salguero

Batista

et al. 2017

Coatings

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Surface engineering is widely used in different areas, such as the aerospace industry or the biomechanical and medical fields. Specifically, laser surface modification techniques may obtain specific surface finishes for special applications. In texturing laser procedures, the control of processing parameters has a great influence on the geometry and characteristics of the treated area. When these processes are carried out on titanium alloys, thin oxide layers are usually developed on the irradiated surface, formed through the thermochemical combination of vaporized material with atmospheric oxygen in the air. In thermal oxidation treatments of Ti6Al4V, the highest concentration of oxides is mainly composed by rutile (TiO 2 ), producing surface property modifications such as hardness, among others. In this research, a thermochemical oxidation of Ti6Al4V alloy has been performed through laser texturing, using laser scanning speed (V s ) and pulse rate (f ) as process control variables, and its influence on the beam absorption capacity of the modified layer have been analyzed. Combined evaluations of microgeometrical features and mechanical properties, such as hardness, verified that, by means of laser texturing treatments, the ability to generate specific topographies and increase the initial hardness of the alloy is obtained. The most advantageous results for the increase of hardness by thermochemical oxidation have been detected in low scan speeds of laser beam treatments, resulting in an increase of approximately 270% using a scanning speed of 10 mm/s. On the other hand, a dependence between roughness values, in terms of R a and R z , and the energy density of pulse (E d ) has been observed, showing higher values of roughness for a 17.68 J/cm 2 energy density of pulse.

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“…As illustrated in Figure 1 , 15 V and 75 V anodization produced yellow/brown colors shades and 30–60 V anodization resulted mostly in blueish shades. These results also correspond to previous studies [ 4 , 31 , 34 ].…”

Section: Discussionsupporting

confidence: 93%

Electrochemical, Biological, and Technological Properties of Anodized Titanium for Color Coded Implants

et al. 2023

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Anodization coloring of titanium tools or implants is one of the common methods for the differentiation of each application by its size or type. Commercial purity titanium grade 4 plates (50 × 20 × 0.1 mm) were tested to obtain their electrochemical and other technological properties. The coloring process was done using the potential of 15, 30, 45, 60, and 75 Volts for 5 s in 1 wt. % citric acid in demineralized water solution. Organic acids solutions generally produce better surface quality compared to inorganic acids. The contact angle of colored surfaces was measured by the sessile drop method. Electrochemical impedance spectroscopy and potentiodynamic polarization were used for the determination of selected electrochemical and corrosion parameters of the tested surfaces. It was found that the anodization process decreases corrosion potential significantly. It was also confirmed that a higher potential used for anodization results in higher polarization resistance but also a decrease in corrosion potential. The anodization process at 75 V produces surfaces with the lowest corrosion rate under 1 nm/year and the noblest corrosion potential. It was confirmed that the anodization process in citric acid does not affect titanium cytotoxicity.

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Evaluation of the influence of texture and microstructure of titanium substrates on TiO2 anodic coatings at 60 V

Cited by 6 publications

References 27 publications

Characterization of the morphology, structure and wettability of phase dependent lamellar and nanotube oxides on anodized Ti-10Nb alloy

Characterization of the morphology, structure and wettability of phase dependent lamellar and nanotube oxides on anodized Ti-10Nb alloy

Effects of Laser Processing Parameters on Texturized Layer Development and Surface Features of Ti6Al4V Alloy Samples

Electrochemical, Biological, and Technological Properties of Anodized Titanium for Color Coded Implants

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