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Electrochemical impedance spectroscopy as a monitoring tool for passivation and localized Corrosion of aluminum alloys
Author(s) -
Mansfeld F.,
Lin S.,
Kim S.,
Shih H.
Publication year - 1988
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.19880391102
Subject(s) - passivation , dielectric spectroscopy , materials science , corrosion , aluminium , metallurgy , pitting corrosion , electrical impedance , crevice corrosion , metal , analytical chemistry (journal) , electrochemistry , electrode , composite material , chemistry , electrical engineering , layer (electronics) , chromatography , engineering
Pitting and crevice corrosion of Al alloys and Al‐based metal matrix composites can be detected by characteristic changes of the impedance spectra in the low frequency region. A pitting model has been developed which is in agreement with the experimental data. A fitting procedure has been used to analyze a large number of data which have been obtained for as‐received samples and samples which had been passivated in CeCl 3 solutions. This chemical passivation process produces surfaces which are very resistant to localized corrosion. Al 6061, Al/SiC and Al/graphite which had been passivated in CeCl 3 for one week did not pit in 0.5 N NaCl for at least one month. Electrochemical impedance spectroscopy (EIS) is a convenient tool for monitoring of the passivation and the corrosion processes.