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Electrochemical Noise Analysis and Electrochemical Impedance Spectroscopy for Pure Copper in Chloride Media
Author(s) -
Nagiub Adham Mohamed
Publication year - 2006
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200690047
Subject(s) - electrochemical noise , dielectric spectroscopy , chemistry , copper , corrosion , polarization (electrochemistry) , electrochemistry , analytical chemistry (journal) , chloride , electrode , electrical impedance , inorganic chemistry , chromatography , organic chemistry , electrical engineering , engineering
The corrosion behavior of pure copper electrode exposed to artificial seawater has been studied using electrochemical noise analysis (ENA) and electrochemical impedance spectroscopy (EIS). A diffusion process was observed for copper exposed to chloride media as indicated by the presence of a minimum phase angle over the lowest frequency range in the impedance plots. Analysis of electrochemical noise (EN) data has been collected both in time and frequency domains. Noise resistance R n was obtained after analyzing EN data in the time domain. A good agreement was observed between R n values and polarization resistance R p values obtained from EIS analysis. Localization index I l was not found to provide information concerning corrosion mechanisms. Also skewness and kurtosis for both potential and current fluctuations did not show any mechanistic information. It was concluded that ENA could detect the corrosion rate for copper exposed to chloride media, but was not found to provide information about the corrosion mechanisms.