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Stimuli-Responsive Intelligent Coatings With Nano/Microcarriers for Early Corrosion Sensing: Advances and Challenges
Jinsong Wang1, Farzad Seidi1, Yuqian Liu1
1Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources and International Innovation Center for Forest Chemicals and Materials, Nanjing Forestry University, Nanjing, China.
Small (Weinheim an Der Bergstrasse, Germany)
|June 5, 2026
Summary
Early detection of metal corrosion is crucial for infrastructure safety. Encapsulating corrosion sensors in nano/microstructures prevents false alarms and enhances coating performance, offering a promising solution.
Area of Science:
- Materials Science
- Corrosion Engineering
- Nanotechnology
Background:
- Metal corrosion poses a significant threat to infrastructure, necessitating early detection to mitigate economic losses and safety hazards.
- Current optical corrosion-sensing methods rely on pH indicators, fluorescent probes, and chromogenic agents, which can trigger false alarms due to leakage from coating matrices.
- Microcracks in coatings can expose metal surfaces, initiating corrosion and requiring integrated damage detection mechanisms like color-changing pigments.
Purpose of the Study:
- To review recent advancements (past five years) in corrosion-sensing coatings.
- To emphasize the encapsulation of sensing compounds within nano/microstructures for improved performance.
- To analyze the advantages and limitations of various corrosion-sensing strategies.
Main Methods:
- Review of scientific literature focusing on corrosion-sensing coatings and encapsulation techniques.
- Analysis of optical sensing mechanisms including pH changes, metal ion complexation, fluorescence, and colorimetric responses.
- Evaluation of nano/microstructure encapsulation methods for sensor protection and coating enhancement.
Main Results:
- Encapsulation of sensing agents in nano/microstructures effectively prevents false alarms from leakage.
- Encapsulated sensors enhance coating mechanical strength and sensor system longevity.
- Incorporation of pigments aids in the rapid detection of coating damage and cracks through color changes.
Conclusions:
- Nano/microstructure encapsulation is a key strategy for developing reliable and durable corrosion-sensing coatings.
- Advanced encapsulation techniques improve sensor stability, prevent false positives, and enhance overall coating functionality.
- Future research should focus on optimizing encapsulation methods and exploring novel sensing materials for comprehensive corrosion monitoring.
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