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Corrosion behavior of carbon steel in chloride contaminated simulated concrete pore solution with carboxylate of benzoic acid and dimethylethanolamine

J.Z. Liu (State Key Laboratory of High Performance Civil Engineering Materials, Research Institute of Building Science, Nanjing, China)
Jing Shun Cai (State Key Laboratory of High Performance Civil Engineering Materials, Research Institute of Building Science, Nanjing, China)
L. Shi (State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Research Institute of Building Science, Nanjing, China)
D. Zhao (State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Research Institute of Building Science, Nanjing, China)
C.C. Chen (State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Research Institute of Building Science, Nanjing, China)
Q. Jiang (State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Research Institute of Building Science, Nanjing, China)
J.F. Sha (State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Research Institute of Building Science, Nanjing, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 4 September 2017

486

Abstract

Purpose

The purpose of this study is to investigate the inhibition efficiency and mechanism of a specific carboxylate corrosion inhibitor which consists of benzoic acid and dimethylethanolamine on steel surface.

Design/methodology/approach

The performance of carbon steel influenced by this organic inhibitor under different concentration of Cl− and immersion time was studied by linear polarization resistance and electrochemical impedance spectroscopy in a simulated concrete pore (SCP) solution. The surface morphology and composition of steel was also analyzed by optical microscopy, SEM and EDS to investigate the effect of inhibitor on the pattern of the steel surface after long-term immersion.

Findings

Carboxylate of benzoic acid and dimethylethanolamine can increase the chloride threshold level and decrease the corrosion area of carbon steel in SCP solution with 0.6 mol/L Cl− even after 120 days exposure. The inhibition mechanism of inhibitor lies in quick adsorption and buffering effect at initial time then formed deposited layer on steel surface after long-term immersion in chloride-rich environment.

Originality/value

It demonstrated that the carboxylate corrosion inhibitor not only can improve the chloride threshold level for carbon steel but also effectively decrease the corrosion rate even in chloride-rich SCP solution after long-term immersion, which is different form the conventional amino alcohol.

Keywords

Acknowledgements

Authors appreciate the financial supports from the National Basic Research Program of China (973 Program) under the contract No. 2015CB655105, National Natural Science Foundation of China (NSFC) (Grant No. 51308261) and Natural Science Foundation of Jiangsu Province (Grant No. BK2012480).

Citation

Liu, J.Z., Cai, J.S., Shi, L., Zhao, D., Chen, C.C., Jiang, Q. and Sha, J.F. (2017), "Corrosion behavior of carbon steel in chloride contaminated simulated concrete pore solution with carboxylate of benzoic acid and dimethylethanolamine", Anti-Corrosion Methods and Materials, Vol. 64 No. 5, pp. 555-562. https://doi.org/10.1108/ACMM-03-2016-1654

Publisher

:

Emerald Publishing Limited

Copyright © 2017, Emerald Publishing Limited

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