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Modified Point Defect Model for the Electrochemical Behavior of the Passive Films Formed on Alloy C (UNS N10002) in Borax Solutions

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Abstract

Utilizing potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS), the passive films properties of alloy C in borax solutions under open circuit potential condition were evaluated. The potentiodynamic polarization curves suggested that alloy C showed excellent passive behavior in borax solutions. The capacitance versus potential curves revealed that the passive films displayed p-type semiconductive characteristics, where the Ni(II) vacancies preponderated over the oxygen vacancies and interstitials. The EIS data showed that the equivalent circuit \({{R}_{{\rm s}}[({R}_{{\rm fs}}{Q}_{{\rm fs}})({R}_{{\rm f}}{Q}_{{\rm f}}) ({R}_{{\rm mf}}{Q}_{{\rm mf}})]}\) by three time constants is applicable. These results also revealed that the measured value of polarization resistance increases with decreasing concentration of borax solutions.

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

    A. Fattah-alhosseini

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  1. A. Fattah-alhosseini
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Fattah-alhosseini, A. Modified Point Defect Model for the Electrochemical Behavior of the Passive Films Formed on Alloy C (UNS N10002) in Borax Solutions. Arab J Sci Eng 40, 63–67 (2015). https://doi.org/10.1007/s13369-014-1501-0

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  • DOI: https://doi.org/10.1007/s13369-014-1501-0

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