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Designing a core-shell structured Ce-MOF-based nanomaterial by Schiff base reaction for pH-responsive self-healing
Yuzhu He1, Wei Li1, Yunqiang Li1
1Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 15000l, China.
Journal of Colloid and Interface Science
|September 13, 2025
Summary
A novel pH-responsive coating uses polyethyleneimine (PEI)-encapsulated nanocontainers with tannic acid (TA) to prevent corrosion. This system offers robust self-healing and anti-corrosion properties for metal protection.
Area of Science:
- Materials Science
- Corrosion Science
- Nanotechnology
Background:
- Nanocontainers enhance self-healing in organic coatings but often suffer from inhibitor leakage during preparation.
- Controlling the release of corrosion inhibitors from nanocontainers remains a challenge for effective anti-corrosion applications.
Purpose of the Study:
- To develop a pH-responsive self-healing anti-corrosion coating system with controlled inhibitor release.
- To investigate the anti-corrosion performance and self-healing capabilities of the proposed coating system.
Main Methods:
- Fabrication of a pH-responsive core-shell nanocontainer system using polyethyleneimine (PEI) and Ce-MOF loaded with tannic acid (TA).
- Coating preparation using an epoxy base incorporating the developed nanocontainers.
- Evaluation of anti-corrosion performance via electrochemical impedance spectroscopy and assessment of self-healing properties through scratch tests.
Main Results:
- The CTAP-EP coating exhibited the highest low-frequency impedance modulus (5.53 × 10^9 Ω·cm^2) after 35 days, indicating robust anti-corrosion performance.
- The self-healing rate of scratched CTAP-EP coatings became positive four times, demonstrating superior self-healing properties.
- The coating provided reinforced active and passive corrosion protection due to the combined effects of TA and Ce^3+ ions.
Conclusions:
- The developed pH-responsive core-shell nanocontainer system effectively prevents spontaneous inhibitor leakage and provides controllable release.
- CTAP-EP demonstrates excellent self-healing and long-term anti-corrosion performance, making it a promising candidate for practical metal protection applications.
