Abstract
Using rice husk ash as silicon source to prepare silica aerogels is one of the most possible ways to realize high value utilization of husk ash. However, the applications of rice husk ash-based silica aerogels (HSAs) using the conventional procedure (without incorporating special materials or processes) are limited due to their relatively inferior properties compared to silica aerogel prepared from conventional silicon sources. Therefore, it is necessary to explore new application areas where HSA can be competent. In this study, HSAs were prepared using a simple conventional protocol and utilized as fillers to enhance the corrosion resistance of epoxy coating. The results showed that the optimal HSA had a specific surface area of 470.3 m2/g and a water contact angle of 158.5°. The HSA/epoxy composite can be prepared simply using a magnetic stiran. When the addition amount is 6%, the coating has the best corrosion resistance. The protection efficiency remaining at 91.4%, after 20 days of immersion in a 3.5% NaCl solution, which was 48.7% for pure epoxy coating. The polarization resistance value was 7591.7% higher compared to pure epoxy coating. This performance was better than that reported for some conventional fillers in the literature. Besides the similar effect as other fillers, it is possible that the HSA may have trapped O2 and Cl−, preventing them from contacting directly with the metal.
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The authors greatly appreciate BOSSARD for providing the salt spray test facilities.
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This work was funded by the National Key Research and Development Program of China (grant No. 2021YFC2102205) and the Carbon Peak Carbon Neutralization Science and Technology Innovation Special Fund of Jiangsu Province (No. BE2022303).
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XW wrote the main manuscript text, prepared the data, and analyzed the data. KD, IB, and CZ optimized and adjusted the structure of the article. YJ, WZ, KD, and XW were responsible for the software used and for the drawing of the graphs. JH, Professor, and Professor YD reviewed and revised important parts of the work. Prof. JH, and Prof. YD reviewed and revised the important contents of the work. All authors reviewed the manuscript.
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Wang, X., Du, K., Jia, Y. et al. A simplified preparation of silica aerogel/epoxy composite coating based on rice husk ash for enhancing corrosion resistance. Clean Techn Environ Policy (2024). https://doi.org/10.1007/s10098-024-02821-2
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DOI: https://doi.org/10.1007/s10098-024-02821-2