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Environmental factors affecting the corrosion behavior of reinforcing steel. IV. Variation in the pitting corrosion current in relation to the concentration of the aggressive and the inhibitive anions
Faculty
Science
Year:
2010
Type of Publication:
Article
Pages:
1675-1683
Authors:
DIAB, A, El Aal, E. E. Abd, El Wanees, S. Abd, El Haleem, S. M. Abd
DOI:
10.1016/j.corsci.2010.01.021
Journal:
CORROSION SCIENCE PERGAMON-ELSEVIER SCIENCE LTD
Volume:
52
Research Area:
Materials Science; Metallurgy \& Metallurgical Engineering
ISSN
ISI:000277224400017
Keywords :
Reinforcing steel, Ca(OH)(2), Aggressive anions, Inhibition, Pitting corrosion current, Repassivation
Abstract:
The pitting corrosion current of reinforcing steel is measured under natural corrosion conditions in Ca(OH)(2) solutions in presence of Cl(-) as aggressive ions and CrO(4)(2-), HPO(4)(2-), NO(2)(-), WO(4)(2-) and MoO(4)(2-) as inhibiting anions. The corrosion current starts to flow after an induction period which depends on solution composition (concentration, pH and presence or absence of the aggressive and the inhibiting anions). The limiting corrosion currents increase with increasing the Cl(-) ion concentration and decrease with increasing the pH and inhibiting ions concentration. The inhibition efficiency of the studied inhibiting ions increases in the following order: CrO(4)(2-) < HPO(4)(2-) < NO(2)(-) < WO(4)(2-) < MoO(4)(2-), and depends on the way by which the inhibitor is added to the solution. Injection of the inhibiting anions in solution causes repassivation of the pre-formed pits through competition with Cl(-) ions for adsorption sites on metal oxide surface. The adsorbability constant and the free energy of repassivation of the inhibiting anions are calculated. (C) 2010 Elsevier Ltd. All rights reserved.
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