Inhibition of Rebar Corrosion by Carbonate and Molybdate Anions
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Bicarbonate/carbonate and molybdate anions have been characterized for their inhibitive effect on pittingcorrosion of carbon steel in simulated concrete pore solution by using electrochemical tests such aselectrochemical impedance (EIS) and linear polarization (LP). It was revealed that bicarbonate/carbonatehas a weak inhibitive effect on pitting corrosion that is approximately one order of magnitude lower comparedto hydroxide. Molybdate is effective against pitting corrosion induced by the concentration of chloride aslow as 113 mM and can increase the pitting potential of a previously pitted sample to the oxygen evolutionpotential by the concentration of molybdate as much as 14.6 mM only. The formation of a CaMoO4 filmon the surface hinders the reduction of dissolved oxygen on the steel surface, reducing corrosion potentialand increasing the safety margin between corrosion potential and pitting potential further. In addition,pore-plugging by FeMoO4 as a type of salt film within pits increases the likelihood of repassivation.
Abstract
Bicarbonate/carbonate and molybdate anions have been characterized for their inhibitive effect on pittingcorrosion of carbon steel in simulated concrete pore solution by using electrochemical tests such aselectrochemical impedance (EIS) and linear polarization (LP). It was revealed that bicarbonate/carbonatehas a weak inhibitive effect on pitting corrosion that is approximately one order of magnitude lower comparedto hydroxide. Molybdate is effective against pitting corrosion induced by the concentration of chloride aslow as 113 mM and can increase the pitting potential of a previously pitted sample to the oxygen evolutionpotential by the concentration of molybdate as much as 14.6 mM only. The formation of a CaMoO4 filmon the surface hinders the reduction of dissolved oxygen on the steel surface, reducing corrosion potentialand increasing the safety margin between corrosion potential and pitting potential further. In addition,pore-plugging by FeMoO4 as a type of salt film within pits increases the likelihood of repassivation.
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