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

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...

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Bibliographic Details
Published in:Arabian Journal for Science and Engineering 2015-01, Vol.40 (1), p.63-67
Main Author: Fattah-alhosseini, A.
Format: Article
Language:English
Subjects:
Borax
Electrochemical impedance spectroscopy
Engineering
Equivalent circuits
Humanities and Social Sciences
Mathematical models
multidisciplinary
Open circuit potential
P-type semiconductors
Polarization
Research Article - Chemistry
Science
Time constant
Vacancies
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Summary: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 s [ ( R fs Q fs ) ( R f Q f ) ( R mf Q 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.
ISSN:1319-8025
2191-4281
DOI:10.1007/s13369-014-1501-0