Abstract
A method for studying the behaviour of iron reinforcement in cured Portland cement paste using linear sweep cyclic voltammetry is described. The use of this method is demonstrated for thein situ study of: (i) the formation of passive films on iron embedded in cement; (ii) the NaCl-induced disruption of these passive films; and, (iii) the protection of passive films on iron in salt-contaminated cement pastes by corrosion inhibitors. Disruption of the passivity was observed upon potential cycling following immersion of cement-embedded iron electrodes for 24h in solutions containing as little as 0.1M NaCl. Corrosion inhibitors such as sodium nitrite, potassium chromate and sodium benzoate all had some beneficial effect in maintaining the passivity of the iron electrodes in the presence of potentially damaging concentrations of NaCl. Of these inhibitors, sodium nitrite was the most effective at the levels used in this study.
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Hinatsu, J.T., Graydon, W.F. & Foulkes, F.R. Voltammetric behaviour of iron in cement II: effect of sodium chloride and corrosion inhibitor additions. J Appl Electrochem 20, 841–847 (1990). https://doi.org/10.1007/BF01094315
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DOI: https://doi.org/10.1007/BF01094315