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Investigation of the initial stage of crevice corrosion on Al99.5 by electrochemical noise analysis
Author(s) -
Schneider M.,
Galle K.
Publication year - 2007
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.200704092
Subject(s) - electrochemical noise , corrosion , crevice corrosion , materials science , aluminium , noise (video) , current (fluid) , metallurgy , current density , pitting corrosion , electrochemistry , chromate conversion coating , work (physics) , electrode , chemistry , physics , computer science , engineering , mechanical engineering , thermodynamics , image (mathematics) , quantum mechanics , artificial intelligence
The electrochemical noise analysis (ENA) is a powerful tool to investigate the initial state of local corrosion processes as pitting corrosion or crevice corrosion on aluminium alloys. The focus of this work lays on Al99.5 (AA1050). In spite of the good corrosion protection and the very low passive current density the noise activity in the early state of corrosion can be very well observed. ENA was performed by using current noise measurement under potentiostatic control. The effect of chromate inhibitors on the noise activity of the initial state of corrosion on Al99.5 is surprisingly negligible. This phenomenon is discussed in this paper.