Evolution of oxide film on the internal porosity of Ti-30Nb-13Ta-2Mn alloy foam

Porous Ti-based alloys are currently considered for application in biomedical implants owing to similarity of their mechanical properties with those of human bone, potentially eliminating the risk of so-called stress shielding. In this work, Ti-30Nb-13Ta-2Mn at.% porous alloy, also referred to as fo...

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Bibliographic Details
Published in:Electrochimica acta 2018-09, Vol.283, p.676-682
Main Authors: Guerra, Carolina, Sancy, Mamié, Walczak, Magdalena, Silva, Daniela, Martínez, Carola, Tribollet, Bernard, Aguilar, Claudio
Format: Article
Language:English
Subjects:
Biocompatibility
Bioengineering
Biomaterials
Biomedical materials
Body fluids
Chemical Sciences
Corrosion products
Electrochemical analysis
Evolution
Exposure
Implants
In vitro methods and tests
Life Sciences
Macroporosity
Mechanical properties
Metallurgy
Microporosity
Microstructure
Oxide
Oxide coatings
Pore size
Porosity
Porous electrode
Powder metallurgy
Scanning electron microscopy
Stress shielding
Surgical implants
Ti-based alloy
Titanium base alloys
Transplants & implants
X-ray diffraction
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Summary:Porous Ti-based alloys are currently considered for application in biomedical implants owing to similarity of their mechanical properties with those of human bone, potentially eliminating the risk of so-called stress shielding. In this work, Ti-30Nb-13Ta-2Mn at.% porous alloy, also referred to as foam, was obtained by the powder metallurgy approach using (NH4)2(CO3) as space-holder. The foam samples were immersed to simulated body fluid after 504 h at 37 °C and the effect of exposure was evaluated by using electrochemical techniques. In addition, microstructure was examined by means of scanning electron microscopy, X-ray diffraction, Archimedes method and nitrogen adsorption isotherms analyzed according to the Brunauer–Emmett–Teller theory. The results revealed two pore size distributions that are modified distinctively during exposure. Whereas macroporosity decreased consistently in time, microporosity evolved to a stable structure in the first hour of exposure to produce an active area of 0.57 m2/g. The electrochemical analysis revealed a passive behavior evolving during exposure due to competitive formation and dissolution of corrosion products at the pores. It is concluded that macroporosity alone is insufficient for explaining corrosion performance of the alloy foam.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2018.05.010