Distribution of steady-state cathodic currents underneath a disbonded coating

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TypeArticle
Journal titleCorrosion
ISSN0010-9312
Volume50
IssueDec 12
Pages907911; # of pages: 5
SubjectBuildings
AbstractPipeline corrosion frequently persists underneath disbanded coatings on pipelines that appear to be well protected cathodically. Application of higher cathodic potentials for improved protection may produce hydrogen gas (H2) bubbles that block current flow underneath a disbanded coating. A project was undertaken to determine whether an increase in applied potential results in higher polarization levels on the crevice should increase. Steady-state cathodic protection experiments were performed at three applied potentials in an electrochemical cell simulating the crevice steel under a disbanded coating. The recorded profiles showed that higher levels of protection underneath a disbanded coating could be achieved by applying higher cathodic potentials. Penetration of the cathodic currents underneath a disbanded coating also was more difficult in higher resistivity solutions.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
IdentifierIRC-P-3158
NRC number35525
3859
NPARC number20375425
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Record identifier6de8d471-a94c-4980-bf7d-7f4b5f83c97e
Record created2012-07-23
Record modified2016-05-09
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