A set of partially immersed reinforced concrete columns with mature corrosion patterns was used to demonstrate that corrosion macrocell currents provided “cathodic prevention” to parts of the steel assembly that remained passive even though exposed to high chloride (~ 4.7% of
the cement weight) concrete. Depassivation of that steel was observed upon macrocell decoupling.
Keywords: Cathodic Prevention, Polarization, Rebar, Concrete