Abstract
Carbon steel coupons were permanently exposed to seawater in the low water zone of two French harbors for 5years before to be subjected to cathodic protection (potential about −0.95V vs. Ag/AgCl/seawater) for 1year. The application of cathodic polarization to the previously unprotected coupons induced the transformation of GR(SO42-) into GR(CO32-). Other coupons were permanently protected by cathodic protection during the 6years immersion. A thin film of green rust and mackinawite was observed on the steel surface. This film was covered by a thicker layer of calcareous deposits.
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