Study of Lower Temperature–Sintered Enamel Coating on Steel Bars: Effect of Coating Cycles
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 9
Abstract
Enamel coating is a novel type of coating for the corrosion protection of reinforcement in concrete. Recently, improved enamel coating was achieved using low-temperature sintering. This study aims to investigate the effect of coating cycles on the microstructure, adhesion, and corrosion resistance of a lower temperature sintered enamel coating. Enamel coated steel bars with single, double, and triple coatings (SC, DC, and TC, respectively) and uncoated (UC) steel bars were prepared. X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive X-ray (EDX) spectroscopy, and pull-off and salt spray tests were performed. The results showed that both the DC and TC had fewer defects and exhibited excellent corrosion resistance compared with that of the SC. However, the transition layer formed at the enamel/steel interface for the DC and TC steel bars weakened the coating adhesion. The related corrosion mechanism was illustrated based on two different corrosion modes: corrosion that occurred at holes (COH) and corrosion that occurred at microcracks (COM).
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors would like to thank Zhenwen Xu for assistance in the experimental preparation part and Yu Peng in the microstructural observation part of this study. In addition, the authors appreciate the financial support from the National Science Foundation of China (Nos. 51522905, 51778570, and 51879230) and the Zhejiang Provincial Natural Science Foundation of China (No. LR15E090001).
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 9 • September 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Sep 24, 2019
Accepted: Mar 2, 2020
Published online: Jun 30, 2020
Published in print: Sep 1, 2020
Discussion open until: Nov 30, 2020
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