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Passivation Behavior of Ultrafine-Grained Pure Copper Fabricated by Accumulative Roll Bonding (ARB) Process

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Abstract

In this study, passivation behavior of ultrafine-grained (UFG) pure copper fabricated by ARB process in 0.01 M borax solution has been investigated. Before any electrochemical measurements, evaluation of microstructure was obtained by transmission electron microscopy (TEM). TEM observations revealed that with increasing the number of ARB passes, the grain size of specimens decrease. Also, TEM images showed that UFGs with average size of below 100 nm appeared after 7 passes of ARB. To investigate the passivation behavior of the specimens, electrochemical impedance spectroscopy (EIS) and Mott-Schottky analysis was carried out. For this purpose, three potentials within the passive region were chosen for potentiostatic passive film growth. EIS results showed that both passive film and charge-transfer resistance increases with increasing the number of ARB passes. Moreover, Mott-Schottky analysis revealed that with increasing the number of ARB passes, the acceptor density of the passive films decreased. In conclusion, increasing the number of ARB passes offers better conditions for forming the passive films with higher protection behavior, due to the growth of a much thicker and less defective films.

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Authors and Affiliations

  1. Department of Materials Engineering, Bu-Ali Sina University, Hamedan, 65178-38695, Iran

    Arash Fattah-alhosseini (Dean of Materials Engineering Department) & Omid Imantalab (Ph.D. Student)

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  1. Arash Fattah-alhosseini
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  2. Omid Imantalab
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Correspondence to Arash Fattah-alhosseini.

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Manuscript submitted March 28, 2015.

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Fattah-alhosseini, A., Imantalab, O. Passivation Behavior of Ultrafine-Grained Pure Copper Fabricated by Accumulative Roll Bonding (ARB) Process. Metall Mater Trans A 47, 572–580 (2016). https://doi.org/10.1007/s11661-015-3239-z

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