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Environmental factors affecting the corrosion behavior of reinforcing steel III. Measurement of pitting corrosion currents of steel in Ca(OH)(2) solutions under natural corrosion conditions
Faculty
Science
Year:
2009
Type of Publication:
Article
Pages:
1611-1618
Authors:
DIAB, A, El Aal, E. E. Abd, El Wanees, S. Abd, El Haleem, S. M. Abd
DOI:
10.1016/j.corsci.2009.04.006
Journal:
CORROSION SCIENCE PERGAMON-ELSEVIER SCIENCE LTD
Volume:
51
Research Area:
Materials Science; Metallurgy \& Metallurgical Engineering
ISSN
ISI:000268656300009
Keywords :
Steel, Steel reinforced concrete, Passive films, Passivity, Pitting corrosion
Abstract:
Using a simple electrolytic cell, the pitting corrosion current of reinforcing steel is measured in Ca(OH)(2) solutions in presence of chloride and sulfate as aggressive ions. Pitting corrosion current starts to flow after an induction period which depends on the concentration of both the aggressive and the passivating anions. The pitting corrosion current densities reach steady-state values which depend also on the type and concentration of the corrosive and passivating anions. The corrosive action of the aggressive species decreased in the order: SO42- > Cl-. Corrosion of the steel is found to be governed by a single electron transfer reaction. Raising the temperature decreases the induction period associated with pit initiation and increases the corrosion current associated with pit propagation. From Arrhenius plots, the activation energies for both pit initiation and pit propagation in presence of chloride and sulfate ions are calculated. (C) 2009 Elsevier Ltd. All rights reserved.
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