Title:
A Study of Corrosion Inhibitor Performance in Chloride Contaminated Concrete by Electrochemical Impedance Spectroscopy
Author(s):
Ping Gu, S. Elliott, R. Hristova, J. J. Beaudoin, R. Brousseau, and B. Baldock
Publication:
Materials Journal
Volume:
94
Issue:
5
Appears on pages(s):
385-394
Keywords:
corrosion; corrosion inhibitor; impedance spectroscopy;
DOI:
10.14359/323
Date:
9/1/1997
Abstract:
Electrochemical impedance spectroscopy and linear polarization techniques were used to study five-year-old 'lollipop-like' concrete specimens containing sodium nitrite and dinitrobenzoic acid. An equivalent circuit model considering the physical characteristics of the rebar/concrete interface was used to simulate the impedance spectra. The RC parameters obtained from the impedance spectra simulation including the maximum phase angle shift and polarization resistance were utilized to characterize the rebar corrosion. The effectiveness of the corrosion-inhibiting additives in the presence and absence of chloride ions was evaluated. The corrosion current densities estimated by impedance measurement were confirmed by those determined using linear polarization techniques. The purpose of this study was to evaluate the long-term performance potential of sodium nitrite and dinitrobenzoic acid used as the corrosion-inhibiting additives in chloride contaminated reinforced concrete.