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Advances in Materials Science and Engineering
Volume 2017, Article ID 6265184, 14 pages
Research Article

An Electrochemical Study to Evaluate the Effect of Calcium Nitrite Inhibitor to Mitigate the Corrosion of Reinforcement in Sodium Chloride Contaminated Ca(OH)2 Solution

1Hanyang Experiment and Consulting, Hanyang University, ERICA, Ansan 15588, Republic of Korea
2Department of Architectural Engineering, Hanyang University, ERICA, Ansan 15588, Republic of Korea
3Department of Building System Engineering, Kangwon National University, Samcheok 25913, Republic of Korea

Correspondence should be addressed to Jitendra Kumar Singh;

Received 25 November 2016; Accepted 2 February 2017; Published 23 February 2017

Academic Editor: Patrice Berthod

Copyright © 2017 Hwa-Sung Ryu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The effect of calcium nitrite (Ca(NO2)2) was assessed by electrochemical means such as open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), and potentiodynamic studies in saturated Ca(OH)2 solution contaminated with 0.99 and 7.91 g/L NaCl. The preliminary results of OCP showed that the potential is shifted towards positive (noble) side as content of inhibitor increased. The EIS results indicate that Ca(NO2)2 works effectively in reduction and initiation of corrosion of steel rebar in NaCl contaminated Ca(OH)2 solution. Potentiodynamic studies revealed the pitting tendency of steel rebar exposed in 0.99 g/L NaCl at [Cl/] = 1.2 attributed to low conductivity of passive film which causes interference for Cl ions attack during anodic polarization. The 85.75% efficiency is found in 0.99 g/L at [Cl/] = 1.2. The Ca(NO2)2 inhibitor transformed the unstable iron oxides/hydroxides into stable and protective oxides/hydroxides due to its strong oxidizing nature. Therefore, this inhibitor is sufficiently and significantly reducing the corrosion of steel rebar at even its low concentration with 0.99 and 7.91 g/L NaCl solution.