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Long-term Effects of Migrating Corrosion Inhibitors on Steel Bars in Concrete(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2020年06期
Page:
117-126
Research Field:
Publishing date:

Info

Title:
Long-term Effects of Migrating Corrosion Inhibitors on Steel Bars in Concrete
Author(s):
ZHANG Ji1;  QU Wen-jun2;  ZHU Peng2
1. China MCC20 Group Corp. Ltd, Shanghai 201999, China; 2. College of Civil Engineering, Tongji University, Shanghai 200092, Shanghai, China
Keywords:
migrating corrosion inhibitor;  corrosion;  carbonation;  electrochemical impedance spectroscopy;  potentiodynamic polarization curve
PACS:
TU503
DOI:
-
Abstract:
Simulated concrete pore solution with migrating corrosion inhibitor(MCI)was adopted to simulate reinforced concrete applied MCI and the decreases of MCI concentration and pH value in pore solution were used to simulate the outward diffusion of MCI and carbonation respectively, with the aim of studying the long-term effects of MCI on the passivated steel bars in concrete. The influences of MCI types(amino alcohol based N, N-dimethylethanolamine DMEA and amino carboxylate based ethylenediaminetetraacetic acid tetrasodium salt EDTA-4Na)and MCI concentrations(0.1 mol·L-1 and 0.05 mol·L-1)were investigated. The evolutions of impedance and corrosion rates of steel bars with MCI concentration and pH were studied by electrochemical impedance spectroscopy and potentiodynamic polarization curve tests. The study results show that initial concentration has an effect on the durability of DMEA and the higher the MCI concentration used initially, the more uniform the adsorbing layer on the surface of the steel bar, and the less sensitive to the decrease of the surrounding MCI concentration. However, EDTA-4Na weakens the impedance of the steel bar when the MCI concentration decreases. As pH decreases, the adsorption layer of DMEA desorbs with the decrease of impedance and increase of corrosion current density while the inhibiting effect of EDTA-4Na enhances and the corrosion current density of the steel bars drops. The corrosion resistance of DMEA is stable and the steel bars are remained in passivation state all the time when MCI concentration and pH drop, but EDTA-4Na cannot provide stable corrosion resistance and the steel bars are in depassivation state most of the time.

References:

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