Corrosion resistance improvement of additive manufactured scaffolds by anodizing

•Ti–6Al–4V ELI scaffolds were produced by additive manufacturing.•Nanoporous anodic layers were grown on scaffolds by anodizing.•Scaffolds geometry and rough surface make them susceptible to pitting corrosion.•Anodizing prevents pitting on scaffolds and reduces passive current density.•Anodic films...

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Bibliographic Details
Published in:Electrochimica acta 2021-01, Vol.366, p.137423, Article 137423
Main Authors: Longhitano, Guilherme Arthur, Conde, Ana, Arenas, Maria Angeles, Jardini, André Luiz, Zavaglia, Cecília Amélia de Carvalho, Maciel Filho, Rubens, de Damborenea, Juan José
Format: Article
Language:English
Subjects:
Additive manufacturing
Anodizing
Corrosion resistance
Cyclic potentiodynamic polarization
Electrochemical impedance spectroscopy
Microscopy
Pitting (corrosion)
Saline solutions
Scaffolds
Spectrum analysis
Submerging
Titanium base alloys
Ti–6Al–4V ELI
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Summary:•Ti–6Al–4V ELI scaffolds were produced by additive manufacturing.•Nanoporous anodic layers were grown on scaffolds by anodizing.•Scaffolds geometry and rough surface make them susceptible to pitting corrosion.•Anodizing prevents pitting on scaffolds and reduces passive current density.•Anodic films present good stability after 168 h of immersion. Ti–6Al–4V ELI scaffolds produced by additive manufacturing and functionalized by anodizing technique in two different conditions have been evaluated using scanning electron microscopy, energy-dispersive X-ray spectroscopy, optical confocal microscopy, cyclic potentiodynamic polarization curves (CPP), and electrochemical impedance spectroscopy (EIS). Despite the differences in composition and morphological features between the anodic layers grown, the results revealed an improvement of the corrosion resistance in both anodized conditions regarding non-anodized samples. The non-anodized scaffolds presented pitting corrosion in phosphate-buffered saline solution at 37 °C. Conversely, the anodized samples prevented pitting corrosion and enhanced barrier properties by decreasing the passive current density in two orders of magnitude. EIS data show, anodized scaffolds presented good stability after 168 h of immersion time and better protective properties than non-anodized samples. [Display omitted]
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2020.137423