Effectiveness of migratory corrosion inhibitors in simulated pore water of chloride-contaminated concrete by means of electrochemical Techniques

Title: Effectiveness of migratory corrosion inhibitors in simulated pore water of chloride-contaminated concrete by means of electrochemical Techniques
Author(s): Z. Liu, C. Miao, J. Liu, W. Sun
Paper category : conference
Book title: International Conference on Microstructure Related Durability of Cementitious Composites
Editor(s): W. Sun, K. van Breugel, C. Miao, G. Ye and H. Chen
Print-ISBN: 978-2-35158-065-3
e-ISBN: 978-2-35158-084-4
Publisher: RILEM Publications
Publication year: 2008
Pages: 1367 - 1375
Total Pages: 9
Nb references: 10
Language: English

Abstract: Corrosion of steel in concrete is the major cause of premature deterioration of reinforced concrete structures. Various methods to improve the durability and extend the service life of concrete structures have been used for the past two decades. More recently,migrating corrosion inhibitors (MCI) are found to be one of the most simple and effective methods to control rebar corrosion in concrete structures. This study was performed to test the inhibition properties of amino-alcohol and amine-carboxylates based corrosion inhibitors in solutions of simulating the concrete pore water and thus to develop curative inhibitor. The results show that the monoamine-carboxylate inhibitor was inefficient when it was used in the conditions of chloride contamination solution and only the ternary amine-carboxylates inhibitor showed an acceptable inhibitive action. The linear polarization resistance and potentiodynamic scanning curves show that the curative inhibitor is not only able to effectively decrease the corrosion rate of the steel electrode in chloride containing environment but has a excellent self-repairing ability even when the steel is under strong anodic polarization. The test of integrative effect with surfactant addition in the curative inhibitor further indicate that the inhibition properties have great increase in Ca(OH)2 solution with 1-3% NaCl. The electrochemical impedance spectroscopy (EIS) fitting data suggest that the protective layer of the curative inhibitor at the surface of steel becomes homogeneous and compact in presence of chloride. The results in this work help to fill some doubts on the performance of organic inhibitors and help to develop a curative inhibitor.

Online publication: 2009-06-09
Publication type : full_text
Public price (Euros): 0.00