Corrosion resistance of porous titanium in some aggressive media

1968 ◽  
Vol 7 (12) ◽  
pp. 977-981 ◽  
Author(s):  
D. S. Arensburger ◽  
V. S. Pugin ◽  
I. M. Fedorchenko
Keyword(s):  
Corrosion Resistance ◽  
Porous Titanium

Porous Ti-6Al-4V Alloy Prepared by a Press-and-Sinter Process

2012 ◽  
Vol 520 ◽  
pp. 76-81 ◽  
Author(s):  
Hai Lian Bi ◽  
Chang Zhou Yu ◽  
Peng Cao ◽  
Yue Hui He
Keyword(s):  
Tensile Strength ◽  
Corrosion Resistance ◽  
Sinter Process ◽  
Porous Titanium ◽  
Nominal Composition ◽  
Alloyed Powder ◽  
Blended Elemental ◽  
Young’S Moduli ◽  
Porous Ti ◽  
Powder Sintering

This paper reports the synthesis of porous titanium with a nominal composition of Ti-6 wt%Al-4wt%V through a press-and-sinter process. Blended elemental (BE) mixtures of Ti and master alloy Al-40V powders were uniaxially pressed and sintered in vacuum. Porosity of the sintered samples was determined in the range of 23vol. % to 37vol. % by the Archimedes method. Tensile strengths were found to range from 73 to 147MPa and Young’s moduli of the sintered samples varied from 3.4GPa to 13GPa. Both tensile strength and elastic modulus decreased with increasing porosity. Electrochemical assessment of the sintered porous samples showed deteriorated corrosion resistance, as compared to 95% dense Ti-6Al-4V prepared by sintering pre-alloyed powder. The challenge of using blended elemental powder sintering to fabricate porous Ti-6Al-4V alloys is discussed.

scholarly journals Improved Corrosion Behavior and Biocompatibility of Porous Titanium Samples Coated with Bioactive Chitosan-Based Nanocomposites

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6322
Author(s):  
Cristina García-Cabezón ◽  
Vanda Godinho ◽  
Coral Salvo-Comino ◽  
Yadir Torres ◽  
Fernando Martín-Pedrosa
Keyword(s):  
Corrosion Resistance ◽  
Stress Shielding ◽  
Porous Titanium ◽  
Substrate Material ◽  
Titanium Implants ◽  
Potential Candidate ◽  
Protection Efficiency ◽  
Cellular Behavior ◽  
One Step ◽  
Current Densities

Porous titanium implants can be a good solution to solve the stress shielding phenomenon. However, the presence of pores compromises mechanical and corrosion resistance. In this work, porous titanium samples obtained using a space-holder technique are coated with Chitosan, Chitosan/AgNPs and Chitosan/Hydroxyapatite using only one step and an economic electrodeposition method. The coatings’ topography, homogeneity and chemical composition were analyzed. A study of the effect of the porosity and type of coating on corrosion resistance and cellular behavior was carried out. The electrochemical studies reveal that porous samples show high current densities and an unstable oxide film; therefore, there is a need for surface treatments to improve corrosion resistance. The Chitosan coatings provide a significant improvement in the corrosion resistance, but the Chitosan/AgNPs and Chitosan/HA coatings showed the highest protection efficiency, especially for the more porous samples. Furthermore, these coatings have better adherence than the chitosan coatings, and the higher surface roughness obtained favors cell adhesion and proliferation. Finally, a combination of coating and porous substrate material with the best biomechanical balance and biofunctional behavior is proposed as a potential candidate for the replacement of small, damaged bone tissues.

Porous Titanium Scaffolds for Biomedical Applications: Corrosion Resistance and Structure Investigation

2011 ◽  
Vol 674 ◽  
pp. 41-46 ◽  
Author(s):  
Bogdan Dabrowski ◽  
Janusz Kaminski ◽  
Wojciech Swieszkowski ◽  
Krzysztof J. Kurzydlowski
Keyword(s):  
Corrosion Resistance ◽  
Biomedical Applications ◽  
Electrochemical Impedance ◽  
Biomedical Application ◽  
Total Porosity ◽  
Porous Titanium ◽  
Porous Metals ◽  
Porous Ti ◽  
A Cell ◽  
Good Biocompatibility

Due to its suitable physical properties and good biocompatibility, the titanium (Ti) can be used for development of porous structures for biomedical applications. The state of art in the field of corrosion resistance showed problems with corrosion analysis of porous metals. Therefore, it is essential to understand the influence of porosity of metals on corrosion parameters. The aim of this study was to investigate the corrosion resistance of highly porous titanium scaffolds for biomedical application. The Ti scaffolds were fabricated by powder metallurgy technique. The total porosity of the scaffolds ranged from 45 to 75%. The cast Ti sample was also tested for comparison. The electrochemical behavior of the Ti samples was monitored by electrochemical impedance spectroscopy (EIS) and potentiodynamic method at the room temperature. All electrochemical experiments were performed by a three-electrode technique in a cell containing a 0.9% NaCl electrolyte solution. With use of AAF, the active area of porous Ti was estimated. The porous Ti with porosity of 75% shows a better resistance to corrosion than the other porous Ti scaffolds. However, the corrosion resistance of Ti scaffolds was lower than cast Ti.

Ti-13Nb-13Zr Foams for Surgical Implants

2008 ◽  
Vol 591-593 ◽  
pp. 24-29 ◽  
Author(s):  
Vinicius André Rodrigues Henriques ◽  
Eduardo T. Galvani ◽  
Carlos Alberto Alves Cairo ◽  
Elisa B. Taddei
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Porous Titanium ◽  
Cold Isostatic Pressing ◽  
Metallurgical Process ◽  
Powder Metallurgical Process ◽  
Surgical Implants ◽  
Low Modulus ◽  
Highly Porous ◽  
Conventional Stainless Steel

The use of titanium and its alloy as biomaterial is increasing due to their low modulus, superior biocompatibility and enhanced corrosion resistance when compared to more conventional stainless steel and cobalt-based alloys. Ti-13Nb-13Zr is a titanium alloy specifically developed for surgical implants. In this work, highly porous titanium foams, with porosities above from 50%, are reached using an efficient powder metallurgical process, which includes the introduction of a selected spacer into the starting powders. Samples were produced by mixing of initial metallic powders followed by uniaxial and cold isostatic pressing with subsequent densification by sintering. The samples presented a Widmanstättenlike microstructure in an open cellular morphology with pore size between 200-500 μm.

Evaluation and regulation of the corrosion resistance of macroporous titanium scaffolds with bioactive surface films for biomedical applications

2019 ◽  
Vol 7 (21) ◽  
pp. 3455-3467 ◽  
Author(s):  
Xingyu Zhou ◽  
Xi Fu ◽  
Hongjie Chen ◽  
Zhanwen Xiao ◽  
Li Min ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Biomedical Applications ◽  
Porous Titanium ◽  
Electrochemical Analysis ◽  
Surface Films ◽  
Bioactive Film

A three-layer bioactive film on porous titanium was constructed and evaluated for its corrosion resistance via electrochemical analysis.

Corrosion Resistance Evaluation of Porous Titanium with Biomimetic Coatings

2008 ◽  
Vol 591-593 ◽  
pp. 55-60 ◽  
Author(s):  
E.P. Banczek ◽  
S.L. de Assis ◽  
Marize Varella de Oliveira ◽  
Waléria Silva de Medeiros ◽  
Luiz Carlos Pereira ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Body Fluid ◽  
Electrochemical Impedance ◽  
Surface Film ◽  
Phosphate Buffer Solution ◽  
Porous Titanium ◽  
Buffer Solution ◽  
Porous Ti ◽  
Potentiodynamic Polarisation ◽  
Sbf Solution

In this work, porous titanium samples processed by powder metallurgy and coated with biomimetic coatings, obtained during different periods of immersion in a simulated body fluid (SBF), were tested for corrosion resistance in a phosphate buffer solution (PBS). Uncoated samples were also tested for comparison. The corrosion resistance of both types of titanium samples was evaluated by electrochemical impedance spectroscopy and potentiodynamic polarisation curves. The electrochemical results indicated the formation of a surface film on the porous Ti samples with immersion in the SBF solution and this biomimetic film increased their corrosion resistance. This film helps osteointegration besides increasing corrosion resistance.

Study of Corrosion-Resistance on Biomedical Coating by Different Surface Treatments

2014 ◽  
Vol 563 ◽  
pp. 391-395
Author(s):  
Hui Ping Shao ◽  
Sheng Jiang Wu ◽  
Tao Lin ◽  
Ran Wei
Keyword(s):  
Corrosion Resistance ◽  
Composite Coatings ◽  
Substrate Surface ◽  
Porous Titanium ◽  
Gel Casting ◽  
Polarization Test ◽  
Naoh Solution ◽  
Simulated Body Fluids ◽  
Surface Morphologies ◽  
Biomedical Coating

The porous titanium alloy prepared by gel-casting methods was used as precursor and the composite coatings with hydroxyapatite HA/TiO2were prepared on the precursor which was treated by NaOH solution, H2O2+ NH3solution, HF+HNO3, PdCl2solution to improve the capability of coatings. The microstructure was examined by SEM and the corrosion behavior of the coating layers in the simulated body fluids (SBF) was evaluated by potentiodynamic polarization test and impedance plots. The results show that the corrosion resistance of samples using PdCl2treatment is superior to else others. The PdCl2processing provides the substrate surface an excellent oxide film, which plays a key role in the corrosion resistance of coating. The thickness of the coatings is about 60μm and the surface morphologies are more uniform than the others and have no crack.

Anodic oxidation of PM porous titanium for increasing the corrosion resistance of endosseous implants

2015 ◽  
Vol 149-150 ◽  
pp. 453-459 ◽  
Author(s):  
Ana-Maria Salantiu ◽  
Catalina Fekete ◽  
Liana Muresan ◽  
Petru Pascuta ◽  
Florin Popa ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Anodic Oxidation ◽  
Porous Titanium ◽  
Endosseous Implants

scholarly journals Influence of simulated body fluid (normal and inflammatory) on corrosion resistance of anodized titanium

2021 ◽  
Vol 10 (10) ◽  
pp. e122101018606
Author(s):  
Sandra Raquel Kunst ◽  
David de Oliveira Cerveira ◽  
Jane Zoppas Ferreira ◽  
Thaís Francine Graef ◽  
Joseane de Andrade Santana ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Simulated Body Fluid ◽  
Body Fluid ◽  
Sessile Drop ◽  
Pure Titanium ◽  
Electrochemical Corrosion ◽  
Porous Titanium ◽  
Commercially Pure Titanium ◽  
Inflammatory Conditions ◽  
Titanium Grade

Titanium has been widely used as biomaterial, especially in implantables, in which osseointegration and corrosion resistance are needed. Studies have shown that the thickness and roughness of porous titanium oxides are related to the osseointegration. According to the literature, the best anodizing conditions for obtaining nanotubes in titanium oxide are the use of a voltage of 10V in an electrolyte containing 0.15% HF in H3PO4 (w/v). In this study, was to evaluate the corrosion capacity of simulated body fluid (SBF) over titanium samples anodized on 1 mol. L-1 H3PO4 and 0.15% HF (w/v) in 1 mol.L-1 H3PO4. To perform these evaluations samples of commercially pure titanium grade 2 were used. Samples were analyzed by scanning electron microscopy, atomic force microscopy and by electrochemical corrosion tests in healthy and simulating inflammatory conditions. The hydrophobicity of oxides was tested by sessile drop essay, also using SBF. Results show that oxides obtained in H3PO4 electrolyte, barrier type oxides, work better than the porous oxides obtained in H3PO4/HF electrolyte, suggesting that barrier oxide exhibit more biomaterial characteristics than the porous oxide. These results agree with previous studies, and stand out mainly in relation to the tests performed under inflammatory conditions, more aggressive to the biomaterial.

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