Effect of a crevice on the breakdown potentials (Eb) of carbon steel specimens in pH 12.6 saturated calcium hydroxide (Ca[OH]2) solution (SCS) and pH 13.6 simulated concrete pore solution (SPS) with 0.01 M to 1.0 M chloride concentration ([Cl–]) was studied with potentiodynamic polarization. The presence of a crevice substantially lowered (by ~ 0.2 V) the Eb in SCS when [Cl–] ≥ 0.1 M. In SPS, passive film breakdown did not take place up to the oxygen evolution potential (OEP) in the absence of a crevice. However, corrosion developed in the crevice at potentials ~ 0.5 V below the OEP when a crevice was introduced and [Cl–] ≥ 0.1 M.

Subject
Steel surfaces, Hydroxides, Concrete pores, Rebar, Sodium chloride, Corrosion initiation, Acidity, Crevices, Sodium chloride solution, Crevice corrosion, Steel, Passivity, Concrete
Keywords:
chloride, concrete, crevice corrosion, epoxy, polarization, rebar, steel
NACE International
2000
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