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Dual-Layer Anticorrosion Coating: Advanced Multifunctional Coating with Both Superhydrophobicity and pH-Responsive
Lijuan Zhu1, Chun Feng1, Pengao Yu2,3
1State Key Laboratory of Oil and Gas Equipment, Tubular Goods Research Institute of CNPC, Xi'an 710077, China.
Langmuir : the ACS Journal of Surfaces and Colloids
|September 24, 2025
Summary
Researchers developed a dual-layer superhydrophobic coating that provides superior, pH-responsive corrosion protection. This advanced anticorrosion material significantly enhances substrate longevity in harsh environments.
Area of Science:
- Materials Science
- Corrosion Science
- Surface Chemistry
Background:
- Developing advanced coatings is crucial for protecting materials from environmental degradation.
- Superhydrophobic surfaces offer unique protective properties but often lack responsiveness.
- Corrosion inhibitors are vital for extending material lifespan, yet their controlled release remains a challenge.
Purpose of the Study:
- To create a multifunctional, dual-layer coating with superhydrophobic and pH-responsive properties.
- To enhance corrosion resistance through a novel nanocontainer system encapsulating a corrosion inhibitor.
- To investigate the long-term performance and inhibitor release mechanism of the developed coating.
Main Methods:
- Modification of ZIF-8 with stearic acid and loading of 2-amino-5-mercapto-1,3,4-thiadiazole (AMT) to create superhydrophobic nanocontainers.
- Application of a dual-layer coating using brushing and spraying techniques.
- Evaluation of anticorrosion performance via electrochemical impedance spectroscopy in 3.5 wt% NaCl solution.
- Verification of inhibitor release using scratch tests and UV-vis spectroscopy.
Main Results:
- The dual-layer superhydrophobic anticorrosion coating (ZST/EP-S) demonstrated exceptional corrosion resistance, maintaining a high low-frequency impedance after 40 days of immersion.
- The impedance value of ZST/EP-S was significantly higher (4 orders of magnitude) than pure EP and 1 order of magnitude higher than ZST/EP.
- Scratch tests and UV-vis experiments confirmed the successful encapsulation and triggered release of the corrosion inhibitor AMT.
Conclusions:
- The developed dual-layer superhydrophobic coating exhibits excellent long-term corrosion protection and pH-responsive behavior.
- The novel nanocontainer design effectively encapsulates and releases the corrosion inhibitor, enhancing overall performance.
- This smart coating technology offers a promising solution for advanced material protection in corrosive environments.
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