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Materials 2014, 7(9), 6632-6645; doi:10.3390/ma7096632

Corrosion Resistance of a Sand Particle-Modified Enamel Coating Applied to Smooth Steel Bars

1
Department of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology, Rolla, MO 65401, USA
2
Department of Materials Science and Engineering, Missouri University of Science and Technology, Rolla, MO 65401, USA
3
Managing Partner, Pro-Perma Engineered Coatings, Rolla, MO 65401, USA
*
Author to whom correspondence should be addressed.
Received: 18 June 2014 / Revised: 8 August 2014 / Accepted: 4 September 2014 / Published: 15 September 2014
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Abstract

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. View Full-Text
Keywords: corrosion resistance; enamel coating; sand particles; EIS; SEM; XRD corrosion resistance; enamel coating; sand particles; EIS; SEM; XRD
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Tang, F.; Chen, G.; Brow, R.K.; Koenigstein, M.L. Corrosion Resistance of a Sand Particle-Modified Enamel Coating Applied to Smooth Steel Bars. Materials 2014, 7, 6632-6645.

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