Galvanic coupling between carbon steel and stainless steel reinforcements

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ConferenceCOM2005, Materials Degradation: Innovation, Inspection, Control and Rehabilitation: 21 August 2005, Calgary, Alberta
Pages99117; # of pages: 19
AbstractGalvanic corrosion is a potentially major concern associated with the application of stainless steel reinforcement which is in direct (electrical) contact with carbon steel reinforcement in concrete structures. Judicious use of stainless steel rebar in both new construction and rehabilitation of older structures is a viable, cost-effective option for extending service life and reducing maintenance costs. Questions, however, had arisen about the possibility of increased corrosion due to galvanic effects. This paper investigates the galvanic-coupling behaviours of three different types of stainless steel and carbon steel. Tests were performed both in electrochemical cells and with specimens in concrete inside an environmental chamber. The results show that oxygen reduction on stainless steel is the rate-determining factor for galvanic coupling of these two metals. It is much lower than that of passive carbon steel. As a result, the galvanic coupling of stainless steel with carbon steel will not increase the risk of corrosion of carbon steel reinforcement.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number48162
NPARC number20378089
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Record identifier60889047-c52e-4efc-a064-85cc07db473a
Record created2012-07-24
Record modified2016-05-09
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