Enhancement of the corrosion resistance and mechanical properties of nanocrystalline titanium by low-temperature annealing

Sotniczuk, Agata; Kuczyńska-Zemła, Donata; Królikowski, A.; Garbacz, Halina

doi:10.1016/j.corsci.2018.11.016

Cited by 47 publications

(28 citation statements)

References 52 publications

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“…Similar to pure aluminum, suppression of corrosion current is mainly dominated by anodic current near the open potential, and the passive current density is decreased. 23,137,139) Like other materials, this improvement of resistance to dissolution can be explained by the presence of a dense protective passive film due to accelerated passivation reaction in UFG materials. Inconsistent results have been reported for HPT, in which pure titanium was pressed to reduce the grain size to a surprising 100 nm and corrosion resistance was degraded.…”

Section: Pure Titaniummentioning

confidence: 94%

“…Thermodynamically, pure titanium is passive in solutions over the entire pH range and has very high corrosion resistance. UFG materials have been pressed by ECAP, 23,75,134138) but other SPD methods such as HPT, 115) hydrostatic extrusion, 76,139) FSP, 123) and high-ratio differential speed rolling (HRDSR) 37,41) have also been employed. Like pure magnesium, pure titanium is difficult to deform at room temperature due to its HCP structure.…”

Section: Pure Titaniummentioning

confidence: 99%

“…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. 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.…”

Section: Pure Titaniummentioning

confidence: 99%

“…Unfortunately, there has been few work examining the corrosion behavior with a systematic increase of plastic strain, 136) and the majority of prior works have compared two microstructures of CG and UFG. 23,37,75,76,134,135,137,139) Sotniczuk et al 139) reported that post-ECAP annealing improves corrosion resistance with little grain growth, and attributed this improvement to a reduction of residual dislocations. This interpretation suggests that the effect of SPD on corrosion becomes stronger with more pressing, achieving a more complete level of UFG formation with few dislocations inside the grains.…”

Section: Pure Titaniummentioning

confidence: 99%

“…Therefore, it may be possible that transient nanoscale galvanic cells may form between grain boundaries and surrounding crystals, and these cells become stronger in non-equilibrium grain boundaries. The possible effect of high-energy non-equilibrium grain boundaries coupled with residual dislocations on corrosion resistance of materials deformed by SPD has been presented for pure copper, 43,144,148) titanium 41,75,139) and stainless steels 29,35,36) by observing change in corrosion behavior by post-SPD annealing. Similarly, the potential difference between a single edge dislocation core and the surrounding potential can be estimated from the dislocation core energy…”

Section: General Trends and Corrosion Mechanism Ofmentioning

confidence: 99%

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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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Section: Pure Titaniummentioning

confidence: 94%

Section: Pure Titaniummentioning

confidence: 99%

Section: Pure Titaniummentioning

confidence: 99%

Section: Pure Titaniummentioning

confidence: 99%

Section: General Trends and Corrosion Mechanism Ofmentioning

confidence: 99%

See 3 more Smart Citations

Corrosion Behavior of Severely Deformed Pure and Single-Phase Materials

et al. 2019

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Nanostructured Bulk Titanium with Enhanced Properties—Strategies and Prospects for Dental Applications

Sotniczuk

Garbacz

2021

Adv Eng Mater

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Society is aging fast. The percentage of people aged above 65 years is forecast to rise from 12.4% (in 2000) to 23% by 2100. [1] The figures for 2030 for Europe and the United States are %20% and 30% respectively. [2] At present, almost 23% of US citizens over 65 are completely edentulous, creating great demand for dental replacements. [3] According to the compound annual growth rate (CAGR) forecast, the global dental market is expected to exceed $8 billion by the end of 2024, up from $4.46 billion in 2016. [1] Moreover, with rising life expectancy, modern implants have to serve much longer without requiring revision surgery. This is challenging, especially in the case of elderly people, who tend to suffer diseases that increase the risk of implant rejection. [2] Thus, advanced healthcare requires constant development in the design and fabrication of dental materials. Currently, commercially pure titanium (CP-Ti) is a leading metallic material in the global dental replacements market. [4] This is mainly due to its biocompatibility and high resistance to corrosion in body fluids. Those properties are governed by the presence of a passive layer on Ti surface, created by its strong tendency to oxidize. [5] Nanostructuring by large plastic deformation techniques is a promising approach to altering Ti properties that are essential for dental applications. [1,[6][7][8][9][10] While clinical trials have confirmed the successful application of dental implants fabricated from nanocrystalline Ti, [4,9] works are still ongoing to develop strategies aimed at enhancing biological response and antibacterial properties without impacting mechanical properties. [11][12][13][14] In this Review, we describe recent approaches taken to modify the properties of nanocrystalline Ti for biomedical applications. Our study focuses on the following aspects: (i) improving biomedical nano Ti properties through bulk and surface modifications, and (ii) the effect of microstructural changes induced by processing of nano Ti on the results of modifications. This analysis is prefaced by a brief description of the effect of nanostructure on Ti mechanical and functional properties.

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Effect of synovial fluid temperature on the corrosion resistance of Ti6Al4V, Ti6Al7Nb, and CoCrMo alloys

Fang

Wang

et al. 2020

Materials & Corrosion

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The frictional heat generated during the operation of the joint prosthesis in vivo could change the corrosion resistance of the prosthesis material. In this paper, the corrosion behavior of three medical alloys at different synovial fluid temperatures was analyzed using electrochemical measurement technology. Furthermore, the scanning electron microscope and energy‐dispersive spectrometer were used to characterize the surface morphology and composition of the alloys after long‐term immersion. The results show that increasing temperature causes the open‐circuit potential of titanium alloy to shift negatively and the corrosion tendency to increase. The increasing temperature leads to the decrease of activation energy of titanium alloy, which in turn results in the increase of corrosion current density and accelerated corrosion. The results of Nyquist curves confirmed that the radius of the capacitive arc decreased with the increase of temperature, indicating the deterioration of corrosion resistance. The CoCrMo alloy shows the same regularity as the titanium alloy in 0.9% NaCl, though no obvious regularity in 25% newborn bovine serum; this may be related to the complexity of the corrosion system.

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Enhancement of the corrosion resistance and mechanical properties of nanocrystalline titanium by low-temperature annealing

Cited by 47 publications

References 52 publications

Corrosion Behavior of Severely Deformed Pure and Single-Phase Materials

Corrosion Behavior of Severely Deformed Pure and Single-Phase Materials

Nanostructured Bulk Titanium with Enhanced Properties—Strategies and Prospects for Dental Applications

Effect of synovial fluid temperature on the corrosion resistance of Ti6Al4V, Ti6Al7Nb, and CoCrMo alloys

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