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An intelligent anticorrosion coating based on pH-responsive supramolecular nanocontainers
1School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, JiangSu, People's Republic of China.
Nanotechnology
|November 21, 2012
Summary
Intelligent anticorrosion coatings utilize pH-responsive hollow mesoporous silica nanoparticles (HMSNs) to deliver benzotriazole corrosion inhibitors. These self-healing coatings offer enhanced long-term protection for AA2024 alloy by releasing inhibitors at corroded sites.
Area of Science:
- Materials Science
- Nanotechnology
- Corrosion Science
Background:
- Hollow mesoporous silica nanoparticles (HMSNs) are effective nanocontainers for corrosion inhibitors like benzotriazole.
- Developing stimuli-responsive delivery systems is crucial for advanced anticorrosion technologies.
Purpose of the Study:
- To fabricate and characterize alkaline- and acid-responsive HMSNs for pH-controlled release of benzotriazole.
- To develop an intelligent anticorrosion coating by incorporating these responsive HMSNs into a hybrid zirconia-silica sol-gel matrix.
- To evaluate the self-healing and long-term corrosion protection performance of the developed coating on AA2024 alloy.
Main Methods:
- Fabrication of HMSNs using the hard-template method.
- Creation of alkaline-responsive HMSNs using cucurbit[6]uril (CB[6])/bisammonium supramolecular complex.
- Creation of acid-responsive HMSNs using α-cyclodextrin (α-CD)/aniline supramolecular complex.
- Characterization using solid-state NMR, TGA, SEM, TEM, and N(2) adsorption-desorption analysis.
- Incorporation of HMSNs into a hybrid zirconia-silica sol-gel coating.
- Evaluation of anticorrosion performance using electrochemical impedance spectroscopy (EIS).
Main Results:
- Successfully synthesized alkaline- and acid-responsive HMSNs capable of pH-controlled benzotriazole encapsulation and release.
- Developed a hybrid zirconia-silica sol-gel coating uniformly doped with these responsive nanocontainers.
- The intelligent anticorrosion coating demonstrated superior long-term corrosion protection for AA2024 alloy compared to the undoped coating.
- The enhanced protection is attributed to the targeted release of benzotriazole from HMSNs in response to local pH changes at corroded areas.
Conclusions:
- pH-responsive HMSNs serve as effective nanocontainers for controlled release of corrosion inhibitors.
- The integration of these nanocontainers into sol-gel coatings creates intelligent self-healing anticorrosion systems.
- This approach offers a promising strategy for enhancing the durability and protective performance of metallic materials.
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