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Crevice corrosion and pitting detection on 304 stainless steel using electrochemical noise
Author(s) -
Conde A.,
Williams D.
Publication year - 1999
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/(sici)1521-4176(199910)50:10<585::aid-maco585>3.0.co;2-y
Subject(s) - electrochemical noise , pitting corrosion , corrosion , metallurgy , crevice corrosion , electrochemistry , chemistry , electrode , austenite , metal , die (integrated circuit) , noise (video) , analytical chemistry (journal) , materials science , nanotechnology , chromatography , microstructure , image (mathematics) , artificial intelligence , computer science
Random fluctuations in current and voltage under free corroding conditions have been measured on austenitic steel 304 in sodium chloride solutions with different aggressiveness. The evolution of these fluctuations in time and frequency domains is analysed and related to the corrosion process on the surface electrode. When the metal is passive, the noise becomes white meanwhile during localised attack changes in the current and voltage can be found. Electrochemical noise (EN) measurements also showed the ability of the technique to distinguish between different corrosion processes such as pitting or crevice corrosion.