Determination of the chloride threshold concentration for reinforcing steel corrosion initiation in simulated concrete pore solution
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The potential distribution on the surface of reinforcing steel in simulated concrete pore solution with a certain pH value and different chloride ion concentrations was measured and the behavior of the steel corrosion was studied using a scanning micro-reference electrode technique. The Ag/AgCl electrodes improved were served as scanning microelectrodes and micro-reference electrodes, and used to measure the potential distribution on the surface of steel at different time. On the potential map, the bight of the potential peaks represents a tendency towards localized corrosion, and the stable potential peaks on the map indicate the pitting corrosin occurs on the steel surface. The chloride threshold concentration for the reinforcing steel corrosion initiation in simulated concrete pore solution was determined by the trial-and-error method. The Cl- threshold found in the pH 12.0 simulated concrete pore solution was between 0.04-0.05 mol/L.