Electrochemical impedance spectroscopy as a monitoring tool for passivation and localized Corrosion of aluminum alloys | Zendy

Mansfeld F. | Zendy; Lin S. | Zendy; Kim S. | Zendy; Shih H. | Zendy

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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.

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