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Concerning the use of constant phase elements (CPEs) in the analysis of impedance data
Author(s) -
Huang Y.,
Shih H.,
Mansfeld F.
Publication year - 2010
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.200905385
Subject(s) - anodizing , constant (computer programming) , materials science , electrical impedance , phase (matter) , software , experimental data , analytical chemistry (journal) , composite material , computer science , electrical engineering , chemistry , engineering , aluminium , statistics , mathematics , organic chemistry , chromatography , programming language
Impedance spectra obtained for Al6061 samples that had been anodized and sealed in two different processes and subjected to thermal cycling at three different temperatures have been analyzed using the Equivcrt software using a three‐time constant model with four constant phase elements (CPEs). Excellent agreement has been observed between the experimental and the fit data. The high‐frequency data have also been analyzed using the ANODAL software. Excellent agreement between the experimental data and the fit data was found in both cases; however, the fit parameters were quite different. The relationship between the CPEs and the surface properties of the anodized samples has been discussed.