Monitoring Passivation, Pitting Corrosion Initiation, and Propagation of Steel Bar with Iron–Carbon Electroplated Long Period Fiber-Grating Sensor
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 12
Abstract
An iron–carbon electroplated long period grating (LPG) fiber sensor to monitor the passivation, initiation, and propagation of the pitting corrosion of steel bars is characterized in simulated concrete pore solutions. An inner silver is first deposited on the surface of LPG fiber before electroplating the outer iron-carbon layer. The surface topographies of both silver and iron-carbon layers are examined with atomic force microscopy. The corrosion evolution of an iron-carbon layer in different solutions is measured by using electrochemical impedance spectroscopy and linear polarization resistance, and the shift in the resonant wavelength of an iron-carbon electroplated LPG sensor is monitored with a spectrum analyzer. Experimental results show that iron–carbon electroplated LPG sensors can continuously monitor the passivation and initiation of pitting corrosion, while it is not suitable to monitor the propagation of pitting corrosion.
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Data Availability Statement
Some or all data that supports the findings of this study are available from the corresponding author upon reasonable request (open circuit potential, linear polarization resistance, and EIS).
Acknowledgments
This work was supported by the National Natural Science Foundation of China (Nos. 51878119, 51808099, and 51421064) and the Fundamental Research Funds for the Central Universities of China [No. DUT17RC(3)076].
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 12 • December 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Feb 10, 2020
Accepted: Jun 2, 2020
Published online: Sep 22, 2020
Published in print: Dec 1, 2020
Discussion open until: Feb 22, 2021
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