Electrochemical Behavior Assessment of Micro- and Nano-Grained Commercial Pure Titanium in HSO Solutions
Journal of Materials Engineering and Performance, ISSN: 1544-1024, Vol: 26, Issue: 2, Page: 611-620
2017
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Article Description
In this study, the electrochemical behavior of commercial pure titanium with both coarse-grained (annealed sample with the average grain size of about 45 µm) and nano-grained microstructure was compared by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and Mott-Schottky analysis. Nano-grained Ti, which typically has a grain size of about 90 nm, is successfully made by six-cycle accumulative roll-bonding process at room temperature. Potentiodynamic polarization plots and impedance measurements revealed that as a result of grain refinement, the passive behavior of the nano-grained sample was improved compared to that of annealed pure Ti in HSO solutions. Mott-Schottky analysis indicated that the passive films behaved as n-type semiconductors in HSO solutions and grain refinement did not change the semiconductor type of passive films. Also, Mott-Schottky analysis showed that the donor densities decreased as the grain size of the samples reduced. Finally, all electrochemical tests showed that the electrochemical behavior of the nano-grained sample was improved compared to that of annealed pure Ti, mainly due to the formation of thicker and less defective oxide film.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85006873028&origin=inward; http://dx.doi.org/10.1007/s11665-016-2489-2; http://link.springer.com/10.1007/s11665-016-2489-2; http://link.springer.com/content/pdf/10.1007/s11665-016-2489-2.pdf; http://link.springer.com/article/10.1007/s11665-016-2489-2/fulltext.html; https://dx.doi.org/10.1007/s11665-016-2489-2; https://link.springer.com/article/10.1007/s11665-016-2489-2
Springer Nature
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