Materials | |
Corrosion Resistance of a Sand Particle-Modified Enamel Coating Applied to Smooth Steel Bars | |
Fujian Tang1  Genda Chen1  Richard K. Brow2  | |
[1] Department of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology, Rolla, MO 65401, USA; E-Mail:;Department of Materials Science and Engineering, Missouri University of Science and Technology, Rolla, MO 65401, USA; E-Mail: | |
关键词: corrosion resistance; enamel coating; sand particles; EIS; SEM; XRD; | |
DOI : 10.3390/ma7096632 | |
来源: mdpi | |
【 摘 要 】
The protective performance of a sand particle-modified enamel coating on reinforcing steel bars was evaluated in 3.5 wt% NaCl solution by electrochemical impedance spectroscopy (EIS). Seven percentages of sand particles by weight were investigated: 0%, 5%, 10%, 20%, 30%, 50% and 70%. The phase composition of the enamel coating and sand particles were determined with the X-ray diffraction (XRD) technique. The surface and cross-sectional morphologies of the sand particle-modified enamel coating were characterized using scanning electron microscopy (SEM). XRD tests revealed three phases of sand particles: SiO2, CaCO3 and MgCO3. SEM images demonstrated that the enamel coating wetted well with the sand particles. However, a weak enamel coating zone was formed around the sand particles due to concentrated air bubbles, leading to micro-cracks as hydrogen gas pressure builds up and exceeds the tensile strength of the weak zone. As a result, the addition of sand particles into the enamel coating reduced both the coating and corrosion resistances.
【 授权许可】
CC BY
© 2014 by the authors; licensee MDPI, Basel, Switzerland.
【 预 览 】
Files | Size | Format | View |
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RO202003190021960ZK.pdf | 1151KB | download |