On the Repassivation Behavior of High‐Purity Titanium and Selected α, β, and β + α Titanium Alloys in Aqueous Chloride Solutions

Kolman, D. G.; Scully, J. R.

doi:10.1149/1.1836914

Cited by 53 publications

(38 citation statements)

References 3 publications

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“…A decrease in these oxygen species at the surface leads to a relative decrease in the fraction of Ti 3+/4+ that gets reincorporated into the oxide layer with an increase in the relative number of Ti 3+/4+ ions that are etched ͑i.e., dissolve into the solution, forming complexes like TiF 6 2− , TiOH 2+ , TiF x ͑OH͒ y x+y −4 , etc. 24,25 Hence, under the influence of chloride ions we expect that the oxide thickness will approach a new thinner, steady-state oxide layer ͑␦ SS * ͒ as the balance is swayed toward the etching of, and away from reincorporation of, Ti ions.…”

Section: Resultsmentioning

confidence: 99%

A Study of Titania Nanotube Synthesis in Chloride-Ion-Containing Media

Panaitescu¹,

Richter

Menon³

2008

J. Electrochem. Soc.

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We have completed a detailed experimental investigation into the recently discovered synthesis of titania nanotubes in chloride-ion-containing media. We show that the role of the chloride ions is catalytic and it has a strong effect in increasing the reactivity of the solution, while the nature of cations has no visible role. We have identified the critical parameters for optimal growth and fast production of nanotubes, and a basic growth mechanism for the tubes is proposed. This opens routes for significant improvements of the method toward uniformity and/or better overall yield, making it a viable alternative to the present established methods.

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Section: Resultsmentioning

confidence: 99%

A Study of Titania Nanotube Synthesis in Chloride-Ion-Containing Media

Panaitescu¹,

Richter

Menon³

2008

J. Electrochem. Soc.

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“…If the bare surface polarization response was ohmically limited even at a higher solution resistance than predicted, the current density should still vary linearly with the applied potential. 13) Figures 5A-5C indicates a nonlinear response. Therefore, it appears that an ohmic limitation does not limit the observed current density.…”

Section: Discussionmentioning

confidence: 99%

“…The rate of repassivation of many metals makes the acquisition of rapid current decay due to oxide growth difficult. Therefore, depassivation has been investigated by the mechanical breakdown of the passive film employing scratching, 10) guillotining, [11][12][13] or thin-film breaking. 14,15) In these techniques, the relaxation process immediately after the mechanical destruction of the passive film was investigated by chronoamperometry.…”

Section: Introductionmentioning

confidence: 99%

Effects of Biological Factors on the Repassivation Current of Titanium

et al. 2004

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The repassivation current of titanium was measured by a newly designed electrochemical cell that can bare a new metal surface momentarily for the determination of the effects of biological factors such as dissolved oxygen, inorganic ions, amino acids, and proteins, on time transient of repassivation current. For this purpose, saline with various concentrations of dissolved oxygen and Hanks' solution with and without amino acids and proteins were employed as electrolytes. Estimated peak current densities and total charges during repassivation were used for the evaluation of reppasivation current. As a result, dissolved oxygen did not influence the repassivation reaction of titanium. Inorganic ions and proteins accelerated the repassivation, while some amino acids delayed it. If these factors are combined, it is important to reveal which factor governs the reaction. Unfortunately, that problem could not be revealed by this study. The above findings may apply to the dissolution amount of metal ion from depassivated titanium in the human body.

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“…In the fretting fatigue test in PBS(-), a surface oxide film which had formed on the contact surface was broken, and a newly formed surface was exposed during each load cycle. For Zr and its homologous series element Ti, the time required for repassivation was several 10 ms, 22) and the new surface caused 2 mm by fretting was immediately re-oxidized. For Zr-based amorphous alloys, similar behavior was reported, 21) and thus it can be considered that no corrosion pits appeared on the newly formed surface.…”

Section: Effects Of Surface Film Of the Fretted Surfacementioning

confidence: 99%

Fretting Fatigue Properties of Zr-Based Bulk Amorphous Alloy in Phosphate-Buffered Saline Solution

et al. 2004

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A fretting fatigue test was carried out with commercially available Zr-based amorphous alloy in mass%) in air and in a pseudo-body fluid, PBS(-). The fracture behaviors were investigated. The fretting fatigue test was performed under load control using a sinusoidal wave with a stress ratio of 0.1, a frequency of 20 Hz in air or 2 Hz in PBS(-) and a fretting contact pressure of 30 MPa. The 10 7 -cycle fretting fatigue strength in air was one-third the 10 7 -cycle plain fatigue strength. On the other hand, the 2 Â 10 6 -cycle fretting fatigue strength in PBS(-) was approximately two times the fretting fatigue strength in air. However, there was little difference between the friction coefficients in air and PBS(-). SEM observations showed that the actual contact area damaged by fretting in air due to the roughness of the surfaces became smaller than that in PBS(-). Thus, it can be considered that the fretting fatigue strength was decreased since in air the actual contact pressure caused by the roughness became higher than the apparent contact pressure. Also, based on the observation that film-forming elements in PBS(-) were different from those in air, it is believed that the surface film can affect the frictional wear characteristics and contribute to the suppression of fretting fatigue crack initiation.

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On the Repassivation Behavior of High‐Purity Titanium and Selected α, β, and β + α Titanium Alloys in Aqueous Chloride Solutions

Cited by 53 publications

References 3 publications

A Study of Titania Nanotube Synthesis in Chloride-Ion-Containing Media

A Study of Titania Nanotube Synthesis in Chloride-Ion-Containing Media

Effects of Biological Factors on the Repassivation Current of Titanium

Fretting Fatigue Properties of Zr-Based Bulk Amorphous Alloy in Phosphate-Buffered Saline Solution

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