Phase Structure and Corrosion Resistance of Multilayer Low-Temperature Sintered Chemically Reactive Enamel Coatings
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 9
Abstract
The phase structure and corrosion resistance of uncoated, pure enamel-, double-enamel- and triple-enamel-coated hot-rolled plain steel bars were investigated by X-ray diffraction (XRD), laser microscopic Raman spectroscopy, open-circuit potential (OCP), electrochemical impedance spectroscope (EIS), and potentiodynamic polarization curves. Raman spectroscopy tests demonstrated that the crystal phase is dominant on the surface, whereas the amorphous phase was observed in the cross-sectional area and decreased with an increase of distance from the steel-coating interface. The crystal phase decreased and there was almost no amorphous phase after immersion in 3.5% by weight NaCl solution. Electrochemical tests showed that both double-enamel- and triple-enamel-coated steel bars had approximately similar corrosion resistance, which was higher than that of pure enamel-coated steel bars.
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Data Availability Statement
Some or all data that support the findings of this study are available from the corresponding author upon reasonable request (open-circuit potentials, electrochemical impedance spectroscopy, and potentiodynamic polarization).
Acknowledgments
The authors thank Jiahua Deng for assistance in the experiment part of this study. In addition, the authors appreciate the financial support from the National Science Foundation of China (Nos. 51522905, 51778570, 51879230, and 51878119) and the Zhejiang Provincial Natural Science Foundation of China (No. LR15E090001).
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Journal of Materials in Civil Engineering
Volume 32 • Issue 9 • September 2020
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©2020 American Society of Civil Engineers.
History
Received: Dec 7, 2019
Accepted: Feb 24, 2020
Published online: Jun 26, 2020
Published in print: Sep 1, 2020
Discussion open until: Nov 26, 2020
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