Ca-Al LDH hybrid self-healing microcapsules for corrosion protection

被引：0

作者：

Wang, Xingang ^{[1
]}

Zhu, Jielu ^{[1
]}

Zou, Fubing ^{[1
]}

Zhou, Naigen ^{[2
]}

Li, Yujie ^{[1
]}

Lei, Weiyu ^{[1
]}

机构：

[1] School of Infrastructure Engineering, Nanchang University, Nanchang,330031, China

[2] School of Physics and Materials Science, Nanchang University, Nanchang,330031, China

来源：

Chemical Engineering Journal | 2022年 / 447卷

基金：

中国国家自然科学基金;

关键词：

Adsorption - Aluminum alloys - Aluminum corrosion - Cements - Chlorine - Corrosion protection - Corrosion resistance - Density functional theory - Electrochemical corrosion - Electrochemical impedance spectroscopy - Hydration - Microstructure - Self-healing materials;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Ca-Al LDH hybrid self-healing microcapsules were fabricated with tung oil as core and ethyl cellulose (EC) as wall via solvent evaporation method. The self-healing and chlorine adsorption properties of hybrid microcapsules in cement-based materials were investigated. The corrosion resistance performance of microcapsules in simulated chlorine-contaminated concrete pore solution (SCPS) was characterized by electrochemical probe technique. First-principles based on density functional theory was applied to study the hybrid mechanism of Ca-Al LDH on self-healing microcapsules. The results demonstrate that the nano-layered Ca-Al LDH within the hybrid wall provided additional nucleation sites for cement hydration. The chlorine adsorption capacity of cement paste doped with 3 wt% and 6 wt% microcapsules was 14.7% and 26.7% higher than that of pure cement paste in SCPS, respectively. Hybrid microcapsules improved the anticorrosion of steel bars in SCPS by coupling effect of self-healing and chlorine resistance. The formation of Ca-Al LDH@EC hybrid materials is an exothermic process with perfect binding stability. The chlorine adsorption property of microcapsules was improved by the interface charge redistribution of Ca-Al LDH@EC hybrid materials. © 2022 Elsevier B.V.

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