Monitoring and mitigation of sustained, localized pitting corrosion. Page: 2 of 17
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Monitoring and Mitigation of
Sustained, Localized Pitting Corrosion
YuPo J. Lin, Edward J. St.Martin, and James R. Frank
Argonne National Laboratory
Argonne, IL 60439
ABSTRACT
Many unexpected failures in pipelines and storage vessels can be traced to
sustained, localized pitting (SLP) corrosion. Detecting such pitting is often difficult
because standard corrosion probes can only measure generalized corrosion, not the
localized corrosion that can drill holes into metal. Argonne used both laboratory and
field experiments to design a corrosion probe that detect rapid SPL corrosion by taking
electrochemical noise measurements. Argonne researchers have reexamined
electrochemical noise analysis (ENA) of localized corrosion by using hardware, signal
collection, and signal processing designs that are different from those used in
conventional ENA techniques. The new data acquisition system was designed to identify
and monitor the progress of SLP by analyzing the power spectral density (PSD) of the
trend of the corrosion potential noise level (PNL). The results of the PSD analysis
consistently demonstrated that the trends of PNL contain information that can be used to
differentiate between SLP corrosion and general corrosion mechanisms. The degree of
linear slope in the low-frequency portion of the PSD analysis was correlated with the
SLP corrosion process. Laboratory metal coupons, as well as commercial corrosion
probes, were tested to ensure the reproducibility and consistency of the results. Argonne
evaluated the on-line monitoring capability of this new ENA method in a bench-scale
flow-loop system, which simulated microbially influenced corrosion (MIC) activity. The
ENA results demonstrated that this in-situ corrosion monitoring system could effectively
identify SLP corrosion associated with MIC, compared to a more uniform general
corrosion mechanism. A reduction in SLP activity could be clearly detected by the ENA
monitoring system when a corrosion inhibitor was added into one of the test loops during
the corrosion testing. On the basis of the results obtained from laboratory experiments
and field tests, Argonne integrated a user-friendly ENA system, designed for on-line and
continuously monitoring of corrosion activity, that can automatically report the onset of
SLP corrosion.
Keywords: electrochemical noise, corrosion, microbially influenced corrosion (MIC),
sensor, sustained, localized pitting (SLP).
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Lin, Y. P.; St.Martin, E. J. & Frank, J. R. Monitoring and mitigation of sustained, localized pitting corrosion., article, October 29, 2001; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc719846/m1/2/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.