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Simulation of the Relaxation Potential Profile of an ac-dc-ac Test
Joint Authors
Hurley, Michael F.
Allahar, Kerry N.
Sapper, Erik D.
Butt, Darryl P.
Source
International Journal of Corrosion
Issue
Vol. 2014, Issue 2014 (31 Dec. 2014), pp.1-12, 12 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2014-04-03
Country of Publication
Egypt
No. of Pages
12
Main Subjects
Abstract EN
The relaxation period of the accelerated ac-dc-ac test for coatings is associated with the transient electrochemistry that occurs when the immersed coated system is allowed to return to a stable open-circuit condition after being subjected to a cathodic potential.
A mathematical model of the transient electrochemistry that occurs during this relaxation period is presented for coated aluminum.
Expressions for the corrosion potential and corrosion current as functions of the local pH at the metal-coating interface were developed using reported experimental results.
These expressions enabled the simulation of the transient electrochemistry under the constraint of balanced anodic and cathodic current densities.
Regression of the transient relaxation potential profiles to exponential decay functions provided time-constant characterization of the profiles.
Simulated results are presented that demonstrate the influences of the coating's porosity and thickness, the applied dc potential and the metal-coating interface condition on the time-constants associated with the relaxation profile.
Interpretation of experimentally reported relaxation potential profiles supported the analysis of the simulated results.
American Psychological Association (APA)
Allahar, Kerry N.& Hurley, Michael F.& Sapper, Erik D.& Butt, Darryl P.. 2014. Simulation of the Relaxation Potential Profile of an ac-dc-ac Test. International Journal of Corrosion،Vol. 2014, no. 2014, pp.1-12.
https://search.emarefa.net/detail/BIM-500673
Modern Language Association (MLA)
Allahar, Kerry N.…[et al.]. Simulation of the Relaxation Potential Profile of an ac-dc-ac Test. International Journal of Corrosion No. 2014 (2014), pp.1-12.
https://search.emarefa.net/detail/BIM-500673
American Medical Association (AMA)
Allahar, Kerry N.& Hurley, Michael F.& Sapper, Erik D.& Butt, Darryl P.. Simulation of the Relaxation Potential Profile of an ac-dc-ac Test. International Journal of Corrosion. 2014. Vol. 2014, no. 2014, pp.1-12.
https://search.emarefa.net/detail/BIM-500673
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-500673