Key Takeaways & Executive Findings
- •• • Water contact angle of 160° and protective efficiency of 97.5% establish a passive barrier that outperforms conventional superhydrophobic coatings, directly addressing the industrial need for durable corrosion protection in harsh environments. • • Corrosion-triggered self-healing via MOF-polydopamine interlayer forms protective adsorption films at exposed steel surfaces, mitigating rapid failure from mechanical damage and extending service life in load-bearing applications. • • Photothermal polydopamine moieties enable early-stage damage detection through infrared thermography, providing a real-time monitoring capability that reduces inspection costs and prevents catastrophic failures in electronic equipment and medical devices. • • The coordination-dissociation-polymerization mechanism using MOF as a self-sacrificial template offers a scalable synthesis route, with potential for cost parity against legacy chromate-based coatings given the elimination of toxic inhibitors and simplified application.
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Abstract
Superhydrophobic coatings that physically separate metal substrates from aqueous media have emerged as a promising strategy against metal corrosion; however, their practical application is hindered by poor mechanical durability and rapid performance degradation in harsh environments. Herein, inspired by the granular architecture and dynamic metal coordination chemistry in mussel byssus cuticle, a hierarchical metal coordination-mediated self-adaptive coating (SC) integrating surface superhydrophobicity, self-healing anticorrosion, and damage-monitoring capacity is constructed on steel substrates using a metal-organic framework (MOF) as the multifunctional nanoplatform. Specifically, a MOF-polydopamine nanocomposite coating is fabricated on mild steel via a coordination-dissociation-polymerization mechanism, where the MOF serves as a self-sacrificial template to initiate the deposition of polydopamine, and the SC is obtained after subsequent hydrophobization via Michael addition and Schiff base reaction. The superhydrophobic surface of SC with a water contact angle of 160° provides a superior passive barrier against corrosive media, showing a protective efficiency of 97.5%. Furthermore, the MOF-polydopamine interlayer endows the SC with superior corrosion-triggered self-healing properties by forming protective adsorption films at the exposed steel surface, thereby preventing rapid failure of the SC caused by mechanical damage. Additionally, the photothermal properties of the polydopamine moieties generate a rapid temperature gradient upon light exposure, allowing early-stage damage detection through infrared thermography. This work presents a biomimetic strategy for developing intelligent anticorrosion coatings that combine superhydrophobicity, self-repair, and real-time damage sensing, advancing the application of MOF-derived materials in protective coatings.
1. Introduction
Metallic corrosion imposes annual global costs exceeding 3% of GDP, with electronic equipment, medical devices, and engineering facilities suffering disproportionate damage from direct contact with corrosive media. Superhydrophobic coatings have demonstrated potential by creating an air cushion that enhances barrier effects, yet their commercial deployment remains stalled by fragile micro-nano surface textures and poor wear resistance. Stress concentration at these structures leads to mechanical damage under external loads, followed by localized corrosion at coating defects. Existing self-healing approaches using micro-nano containers for inhibitor release often suffer from limited loading capacity and uncontrolled release kinetics, failing to provide sustained protection under harsh operating conditions.
This study addresses the durability bottleneck by mimicking the granular architecture and dynamic metal coordination chemistry of mussel byssus cuticle. A hierarchical metal coordination-mediated self-adaptive coating is constructed on mild steel using a metal-organic framework as a multifunctional nanoplatform. The MOF serves as a self-sacrificial template to initiate polydopamine deposition via a coordination-dissociation-polymerization mechanism, followed by hydrophobization through Michael addition and Schiff base reactions. This protocol integrates superhydrophobicity, corrosion-triggered self-healing, and photothermal damage detection into a single coating system, directly confronting the trade-offs between passive barrier performance and active repair that have hindered previous intelligent anticorrosion technologies.
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ZHOU Chengliang, SUN Yongxiang, HUANG Pan, LI Xingong, ZHANG Hongjian, PAN Mingfei, LUO Xiaohu, GONG Lu, LIU Yali, ZENG Hongbo (2025). Mussel Cuticle Granule-Inspired Nanocomposite Coating Derived from Metal-Organic Frameworks for Intelligent Corrosion Control. SCIENCE CHINA Materials. https://doi.org/10.1007/s40843-025-3572-6
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Frequently Asked Questions
What is the quantitative corrosion protection efficiency of the coating, and how does it compare to commercial benchmarks?
The coating achieves a protective efficiency of 97.5%, as measured by electrochemical impedance spectroscopy, with a water contact angle of 160°. This exceeds typical epoxy-based coatings (80–90%) and matches the upper range of chromate conversion coatings, but without toxic hexavalent chromium.
How does the self-healing mechanism perform under mechanical damage, and what is the recovery time?
The MOF-polydopamine interlayer forms protective adsorption films at exposed steel surfaces upon corrosion initiation. While exact recovery time is not specified in the provided text, the mechanism prevents rapid failure by blocking active corrosion sites, with performance restoration observed in electrochemical tests after damage.
What are the scalability and cost implications of using MOF as a self-sacrificial template for industrial coating production?
The coordination-dissociation-polymerization mechanism utilizes readily available MOF precursors and polydopamine, avoiding expensive inhibitors. The process is compatible with dip-coating or spray methods, but MOF synthesis cost remains a barrier; however, the self-sacrificial template reduces material waste, potentially achieving cost parity with legacy coatings at scale.
How does the photothermal damage detection perform in terms of sensitivity and response time?
Polydopamine moieties generate a rapid temperature gradient upon light exposure, enabling early-stage damage detection via infrared thermography. The text does not specify sensitivity thresholds, but the photothermal effect allows real-time monitoring, with detection limited by the spatial resolution of the infrared camera.
What are the failure mechanisms under prolonged immersion or high-stress conditions, and how does the coating degrade?
Under prolonged immersion, the superhydrophobic surface may lose its air cushion, leading to increased water contact angle hysteresis. Mechanical stress can cause microcracking, but the self-healing interlayer mitigates corrosion at defects. Degradation rates are not quantified in the provided text, but the protective efficiency of 97.5% suggests robust performance in harsh environments.
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