Open AccessSelection of Electrode Area for Electrochemical Noise Measurements to Monitor Localized CO2Corrosion
Author(s) -
Jiang Xiu,
Srdjan Nešić,
F. Huet,
Brian Kinsella,
Bruce Brown,
David Young
Publication year - 2012
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/2.007207jes
Subject(s) - electrochemical noise , electrode , corrosion , scanning electron microscope , polarization (electrochemistry) , materials science , electrochemistry , noise (video) , analytical chemistry (journal) , microscopy , metallurgy , composite material , chemistry , optics , physics , image (mathematics) , chromatography , artificial intelligence , computer science
International audienceThe simultaneous fluctuations of potential noise and current noise between two nominally identical X-65 mild steel electrodes were recorded using a ZRA (Zero Resistance Ammeter) to monitor localized CO2 corrosion in CO2-saturated 1 wt% NaCl solution at 80◦C. Electrochemical noise (EN) was obtained from both 11.6 cm2 and 1 cm2 specimens to understand how the surface area affects EN signals. Linear polarization resistance (LPR) measurements were conducted to investigate the general CO2 corrosion behavior. Surface morphologies and pit depths were observed by scanning electron microscopy (SEM) and infinite focus microscopy (IFM) for 3D optical analysis. The results showed that the electrode area significantly influenced the EN signals of localized CO2 corrosion. Transients related to metastable pitting were best observed with 1 cm2 specimens but not clearly obtained for 11.6 cm2 specimens
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