Effect of immersion time on the passive and electrochemical response of annealed and nano-grained commercial pure titanium in Ringer's physiological solution at 37 degree C

In the present study, various electrochemical tests were used to investigate the passive and electrochemical response of annealed and nano-grained commercial pure Titanium in Ringer's physiological solution at 37 degree C. Nano-grained pure Titanium, which typically has an average grain size of...

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Bibliographic Details
Published in:Materials Science and Engineering C: Biomimetic and Supramolecular Systems 2017-02, Vol.71, p.771-779
Main Authors: Fattah-alhosseini, Arash, Ansari, Ali Reza, Mazaheri, Yousef, Keshavarz, Mohsen K
Format: Article
Language:English
Subjects:
Annealing
Electrochemical impedance spectroscopy
Grain refinement
Grain size
Materials science
N-type semiconductors
Nanostructure
Titanium
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Summary:In the present study, various electrochemical tests were used to investigate the passive and electrochemical response of annealed and nano-grained commercial pure Titanium in Ringer's physiological solution at 37 degree C. Nano-grained pure Titanium, which typically has an average grain size of 90 plus or minus 5nm, was obtained by six-cycle accumulative roll bonding process. Polarization and electrochemical impedance spectroscopy plots illustrated that as a result of grain refinement process, the passive response of the nano-grained sample was improved compared to that of its coarse-grained counterpart in Ringer's physiological solution. Mott-Schottky analysis indicated that the passive films behaved as n-type semiconductors in Ringer's physiological solution and grain refinement did not change the conductivity type of the passive films. Additionally, Mott-Schottky analysis showed that the donor density decreased by grain size reduction. Finally, nano-grained sample appeared to be more suitable for implant applications, mainly due to the formation of thicker and less defective oxide film.
ISSN:0928-4931
DOI:10.1016/j.msec.2016.10.057