article · Advances in Colloid and Interface Science
Metallic structures face severe durability issues from corrosion, prompting the advancement of protective organic coatings. Incorporating porous nano- and microcontainers into these coatings allows for controlled inhibitor release, targeted protection, and defect filling via polymeric matrices. These delivery systems enable smart self-healing and active protection mechanisms. In an evaluated example, a scratched coating incorporating mesoporous silica nanoparticles loaded with benzotriazole and coated with polydopamine showed sustained restoration when immersed in a sodium chloride solution for twenty days. Over this period, its low-frequency impedance rose significantly, demonstrating active self-repair. Beyond corrosion resistance, porous containers can impart secondary functions such as anti-fouling and heat preservation. Despite these advances, ongoing challenges remain in coating design, but these porous delivery systems offer a viable path toward enhanced, multifunctional smart coatings for industrial metal preservation.
Corrosion causes extensive damage to metallic infrastructure across various industries. Integrating smart nano- and microscale reservoirs into protective coatings allows materials to repair themselves autonomously when scratched. This self-healing ability extends the operational lifespan of metal assets, lowers maintenance demands, and reduces the risk of structural failure in aggressive operational environments.
This technology is aimed at industrial sectors managing metallic structures exposed to corrosive environments, including marine and protective coating industries. It enables multifunctional, self-healing coatings that actively repair damage. Because the findings are synthesised from a literature review and laboratory-scale immersion tests, the technology remains at an early to mid-stage research phase, requiring further testing before reaching commercial deployment.
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The durability and functionality of many metallic structures are seriously threatened by corrosion, which makes the development of anticorrosive coatings imperative. This state-of-the-art survey explores the recent developments in the field of anticorrosive organic coatings modulated by innovations involving nano/microcontainers with porous matrices. The integration of these cutting-edge delivery systems seeks to improve the protective properties of coatings by enabling controlled release, extended durability, targeted application of corrosion inhibitors, and can be co-constructed to achieve defect filling by polymeric materials. The major highlight of this review is an in-depth analysis of the functionalities provided by porous nano/microcontainers in the active protection and self-healing of anticorrosive coatings, including their performance evaluation. In one case, after 20 days of immersion in 0.1 M NaCl, a scratched coating containing mesoporous silica nanoparticles loaded with an inhibitor benzotriazole and shelled with polydopamine (MSNs-BTA@PDA) exhibited coating restoration indicated by a sustained corrosion resistance rise over an extended period monitored by impedance values at 0.01 Hz frequency, rising from 8.3 × 104 to 7.0 × 105 Ω cm2, a trend assigned to active protection by the release of inhibitors and self-healing capabilities. Additionally, some functions related to anti-fouling and heat preservation by nano/microcontainers are highlighted. Based on the literature survey, some desirable properties, current challenges, and prospects of anticorrosive coatings doped with nano/microcontainers have been summarized. The knowledge gained from this survey will shape future research directions and applications in a variety of industrial areas, in addition to advancing smart corrosion prevention technology.
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DOI: 10.1016/j.cis.2024.103209
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