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Determination of the polarization resistance from impedance measurements
Author(s) -
Mansfeld Florian,
Kendig M. W.
Publication year - 1983
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.19830340805
Subject(s) - electrical impedance , computation , polarization (electrochemistry) , focused impedance measurement , corrosion , aeration , materials science , analytical chemistry (journal) , computer science , chemistry , algorithm , electrical engineering , engineering , composite material , chromatography , organic chemistry
Four different methods for determining the polarization resistance R p acfrom impedance data are discussed. These methods are suitable for online corrosion monitoring. Their use is illustrated for iron in tapwater and in neutral, aerated Na 2 SO 4 containing various inhibitors. R p ac ‐values obtained with the CIRFIT‐method are compared with R p dcwhich is obtained from a linear sweep through E corr . The integration method has the advantage of computation speed.