Smart protective coatings with self‐sensing and active corrosion protection dual functionality from pH-sensitive calcium carbonate microcontainers
Tong Liu (University of Science and Technology Beijing)
Dawei Zhang (University of Science and Technology Beijing)
Lingwei Ma (University of Science and Technology Beijing)
Yao Huang (University of Science and Technology Beijing)
Xiangping Hao (University of Science and Technology Beijing)
Herman A. Terryn (Vrije Universiteit Brussel)
Johannes M.C. Mol (TU Delft - Team Arjan Mol)
Xiaogang Li (University of Science and Technology Beijing)
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Abstract
Herein, we report the development of a self-sensing and active corrosion protection coating which incorporates pH-sensitive multilayer chitosan/alginate-covered CaCO3 microcontainers containing 1,10-phenanthrolin-5-amine (APhen). The microcontainers can respond to pH variation to release APhen which serves not only as a corrosion indicator but also as an inhibitor. An epoxy coating doped with 5 wt% microcontainers exhibited improved corrosion performance and was capable of inhibiting corrosion spreading from the damaged area in a 3.5 wt% NaCl solution. The salt spray test showed that corrosion damage can be quickly detected by the appearance of a red color within 2 min.