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Updated: Sep 23, 2025

Experimental Protocol to Determine the Chloride Threshold Value for Corrosion in Samples Taken from Reinforced Concrete Structures
Published on: August 31, 2017
Ion-triggered calcium hydroxide microcapsules for enhanced corrosion resistance of steel bars
Zi Liang1,2, Qian Wang2, Biqin Dong1
1School of Civil Engineering, Guangdong Province Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University Shenzhen 518060 China xingf@szu.edu.cn.
Abstract:
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. SO4 2- 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.
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