Effects of galvanic coupling between carbon steel and stainless steel reinforcements

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ConferenceNACE Northern Area 2003 Conference: 14 September 2003, Ottawa, Ontario
Pages126; # of pages: 26
Subjectgalvanic coupling, stainless steel, carbon steel, reinforced concrete, chlorides, oxygen reduction reaction; Concrete
AbstractThe use of stainless steel to replace carbon steel in areas vulnerable to corrosion is an economical approach as it extends the service life of reinforced concrete structures. However, concerns associated with galvanic coupling prevent its application. This paper investigates the galvanic coupling behaviours of carbon steel and stainless steels, and compares them to corroding and passive carbon steels. The polarization curves and cyclic voltammograms of carbon and stainless steels, as well as the galvanic coupling behaviours of the steels are presented. The results show oxygen reduction on stainless steel is the rate-determining step for galvanic coupling between corroding carbon steel and stainless steel. It is much lower than for passive carbon steel, even when stainless steel is exposed to high concentrations of chlorides. Therefore, the galvanic coupling current is lower than that coupling between corroding and passive carbon steels. Theresults also show the galvanic coupling current density is very low (about 1 nA cm-2) and will not initiate the corrosion of carbon steel when passive carbon steel is coupled with stainless steel.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number46634
NPARC number20386105
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Record identifiere702d8a8-1eb0-4a77-9051-9307bedc4ea7
Record created2012-07-25
Record modified2016-05-09
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