Electrochemical Anisotropy of Nanostructured Titanium for Biomedical Implants

Matykina, E.; Arrabal, R.; Valiev, Ruslan Z.; Molina-Aldareguia, J.M.; Belov, P. A.; Sabirov, I.

doi:10.1016/j.electacta.2015.07.128

Cited by 23 publications

(13 citation statements)

References 48 publications

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“…Crystal orientation also has a significant impact on etch rate and topography of surface. Matykina et al [ 20 ] and Hoseini et al [ 28 ] demonstrated that crystallographic texture can significantly influence the corrosion rate of UFG and CG Ti. Moreover, it is shown in [ 28 ] that texture can play greater role than grain size.…”

Section: Discussionmentioning

confidence: 99%

“…Oppositely, despite the wide prospects of UFG titanium and great scientific interest in it, the UFG titanium etching is still not studied enough. There are some works dedicated to UFG titanium corrosion [ 17 , 18 , 19 , 20 ] that suggest significant differences between rate, character, and mechanism of corrosion of UFG and CG titanium. One can expect the differences also in the case of etching.…”

Section: Introductionmentioning

confidence: 99%

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Modification of the Surface Topography and Composition of Ultrafine and Coarse Grained Titanium by Chemical Etching

et al. 2017

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In this study, we present the detailed investigation of the influence of the etching medium (acidic or basic Piranha solutions) and the etching time on the morphology and surface relief of ultrafine grained (UFG) and coarse grained (CG) titanium. The surface relief and morphology have been studied by means of scanning electron microscopy (SEM), atomic force microscopy (AFM), and the spectral ellipsometry. The composition of the samples has been determined by X-ray fluorescence analysis (XRF) and X-ray Photoelectron Spectroscopy (XPS). Significant difference in the etching behavior of UFG and CG titanium has been found. UFG titanium exhibits higher etching activity independently of the etching medium. Formed structures possess higher homogeneity. The variation of the etching medium and time leads to micro-, nano-, or hierarchical micro/nanostructures on the surface. Significant difference has been found between surface composition for UFG titanium etched in basic and acidic Piranha solution. Based on the experimental data, the possible reasons and mechanisms are considered for the formation of nano- and microstructures. The prospects of etched UFG titanium as the material for implants are discussed.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modification of the Surface Topography and Composition of Ultrafine and Coarse Grained Titanium by Chemical Etching

et al. 2017

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“…Therefore, it is typically processed by SPD at relatively high temperatures such as 200°C 137) or 350 to 600°C. 23,75,76,134136,138) except for HPT, which is usually done at room temperature. 115) Despite the higher SPD temperatures, the final grain size is small, typically on the order of 0.2 µm, and residual dislocations can be observed in most cases, suggesting immature UFG formation.…”

Section: Pure Titaniummentioning

confidence: 99%

“…139) Corrosion of pure titanium has been studied for potential use in biomaterials, and like magnesium, they are in many cases evaluated in dilute 0.9% NaCl solution 76,136) or artificial body fluid. 23,135,137,138) with some exception using acidic solutions. 37,41) In most cases, as in other materials, corrosion resistance is evaluated by polarization tests and improved by SPD, although the degree of impact is smallest among the materials studied.…”

Section: Pure Titaniummentioning

confidence: 99%

Corrosion Behavior of Severely Deformed Pure and Single-Phase Materials

et al. 2019

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The significant and complex effect of plastic deformation on corrosion behavior involves changes in not only dislocation density but also other metallurgical factors such as grain size, texture, chemical inhomogeneity, phase transformation and residual stress. With the advent of severe plastic deformation (SPD), the effect of plastic deformation on corrosion in the ultrahigh strain range is becoming an important issue. However, our understanding of corrosion properties of SPD materials lags far behind than that of their other properties, e.g. their mechanical properties. In this review, the role of dislocations and grain boundaries generated by SPD was highlighted in pure metals and single-phase materials, where plastic deformation and grain refinement proceed mainly by dislocation activity. Accordingly, the complicated effect of chemical inhomogeneity arising from impurity segregation and precipitation was excluded from discussion, while other implicit effects were included. It is essential to elucidate the effect of so-called ultrafine-grained (UFG) structures which develop progressively to a saturation over a very wide strain range. Unfortunately, the literature mainly compares the corrosion behavior of UFG and coarse-grained (CG) materials, and the degree of perfection of UFG formation and the resultant effects on corrosion vary between studies. The limited number of studies that examines corrosion behavior systematically over a wide strain range suggests that, in most cases, the effect of plastic deformation on corrosion extends into the SPD region gradually, with no anomalous change. That is, SPD improves the corrosion resistance to further degree in a passive environment, whereas it increases the dissolution rate in a non-passive environment. However, several works reported an abrupt change in corrosion resistance, which could be attributed to UFG formation. A marked improvement is observed in FeCr alloys, where passivation becomes more protective owing to UFG formation induced by SPD. In severely deformed materials, structural alterations in dislocations and grain boundaries have a very high impact on the corrosion kinetics because of their closely spaced configuration.

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“…The surface compositions are eventually modified to the compositions included in the solution. The studies of the reaction of native surface on titanium with the physiological solution were performed by authors [9][10][11][12][13][14][15][16][17][18]. Lu [9] studied the reaction of a polycrystalline titanium surface with oxygen and water molecules at 150-850 K. The oxidations types are varied according to the temperatures of reaction.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Surface Precipitates on Ultrafine-Grained Titanium in Physiological Solution

Zhou

Wang

Zou

2017

Metals

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Enhanced cell adherence to the surface of nanocrystallized commercially pure titanium (CP-Ti) was observed by several authors. However, the understanding of the surface modification of Ti in a physiological solution due to nanocrystallized grain size has not been reached. In this work, equal channel angular pressing (ECAP) was applied to manufacturing ultrafine grained CP-Ti. Martensite and Widmanstatten microstructures were also obtained for comparison. The CP-Ti pieces with different microstructures were subjected to soaking tests in a simulated body fluid. Electrochemical impedance spectroscopy (EIS) measurements, X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM), energy dispersive spectrometer (EDS) were used to characterize the surfaces. The results show the surface precipitates mainly contain Ti, O, Ca and P. The quantity of precipitates on ECAPed CP-Ti is the largest among different specimens corresponded to the observation of the thickest layer formation on ECAPed CP-Ti found by EIS. EDS results show more CaPO and less Ti are included on ECAPed Ti comparing to the deposits on other two types of specimens. Smaller numbers of precipitates and denser film are produced on the surface of the water-quenched CP-Ti. The regeneration kinetics of the CaP precipitates evaluated by Gibbs free energy is introduced to interpret the precipitating behaviors on different CP-Ti specimens.

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Electrochemical Anisotropy of Nanostructured Titanium for Biomedical Implants

Cited by 23 publications

References 48 publications

Modification of the Surface Topography and Composition of Ultrafine and Coarse Grained Titanium by Chemical Etching

Modification of the Surface Topography and Composition of Ultrafine and Coarse Grained Titanium by Chemical Etching

Corrosion Behavior of Severely Deformed Pure and Single-Phase Materials

Enhanced Surface Precipitates on Ultrafine-Grained Titanium in Physiological Solution

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