Threshold chloride levels for localized corrosion of carbon steel material have been studied in three types of simulated concrete pore solutions: NaOH-KOH with pH 11.6, Ca(OH)2 with pH 12.6, and NaOH-KOH-Ca(OH)2 with pH 13.3. The nonuniform corrosion rates of carbon steel were measured with coupled multielectrode array sensors (CMAS) when the chloride concentration was changed from 0.0005 to 1 mol/L in each solution. Open circuit potentials were also measured from the coupling joint of the CMAS probes and electrodes made of rebar specimens immersed in the simulated pore solutions to verify the results from the CMAS probes.

Subject
Corrosion rate, Probes, Rebar, Potential measurements, Chloride solutions, Silicate deposits, Pores, Corrosion probes, Immersion, Chlorides, Electrodes, Corrosion potential, Electrode potential
Keywords:
Corrosion sensor, multielectrode, array sensor, coupled multielectrode, CMAS, threshold chloride level (Cth), reinforced steel bar (rebar), corrosion initiation, simulated pore solution (SPS), open circuit potential (OCP)
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2012
Association for Materials Protection and Performance (AMPP)
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