Ion-triggered calcium hydroxide microcapsules for enhanced corrosion resistance of steel bars
| Autor: | Biqin Dong, Feng Xing, Bingyin Jiang, Zi Liang, Qian Wang |
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| Rok vydání: | 2018 |
| Předmět: |
Calcium hydroxide
Chemistry General Chemical Engineering fungi 0211 other engineering and technologies 02 engineering and technology General Chemistry Permeation 021001 nanoscience & nanotechnology Corrosion Ion chemistry.chemical_compound Monomer Chemical engineering 021105 building & construction Seawater 0210 nano-technology |
| Zdroj: | RSC Advances. 8:39536-39544 |
| ISSN: | 2046-2069 |
| DOI: | 10.1039/c8ra07382a |
| Popis: | Herein, we synthesized Ca(OH)2 microcapsules with ion-responsive shells composed of cross-linked poly-ionic liquids (CPILs). By exchanging PF6− with Cl− in water, the hydrophobic poly-ionic liquids (PILs) on the shell are converted to hydrophilic channels. The encapsulated Ca(OH)2 can permeate through the hydrophilic channels and release OH−. Meanwhile, the Cl− content can be reduced. The release rate of Ca(OH)2 is influenced by the content of monomers and concentration of Cl− ions in water. SO42− can also trigger the release of Ca(OH)2 from the microcapsule. With these microcapsules, Q235 steel exhibited promising corrosion resistance in simulated seawater. These results indicate that encapsulation of corrosion inhibitors is highly desirable for enhanced corrosion resistance of steel bars and the proposed approach can be used to encapsulate various corrosion inhibitors and functional materials for a wide range of applications. |
| Databáze: | OpenAIRE |
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