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Correlation between electrochemical impedance and current distribution of carbon steel under organic coating
Author(s) -
Kong D.,
Wang Y.,
Zhang W.,
Wang W.,
Liu X.,
Wang J.
Publication year - 2012
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.201006035
Subject(s) - coating , dielectric spectroscopy , materials science , carbon steel , electrode , corrosion , degradation (telecommunications) , electrochemistry , composite material , electrical impedance , substrate (aquarium) , carbon fibers , metallurgy , chemistry , electronic engineering , composite number , oceanography , electrical engineering , geology , engineering
The current distribution of carbon steel beneath intact organic coating exposed to 3.5% NaCl solution was investigated by the wire beam electrode (WBE) method. The electrochemical impedance spectroscopy (EIS) of individual electrodes with high current was characterized to analyze the behavior of the coating degradation and metal corrosion at coating/metal interface. The polarity switch of the electrode under the coating was observed. The mechanism of coating degradation and carbon steel substrate corrosion was discussed from a point of electrochemical distribution.