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Smart epoxy/PVDF coating with ZIF-8 nanosensors protects steel from corrosion
Researchers have developed a multifunctional epoxy/PVDF coating incorporating ZIF-8 nanosensors. The system provides self-healing, corrosion protection and optical self-reporting of early corrosion processes.
A joint team from India and Germany has presented an innovative smart coating for corrosion protection of mild steel. The system is based on an epoxy/polyvinylidene fluoride (EPV) matrix incorporating two types of ZIF-8 particles: benzotriazole-loaded particles (ZBT) enabling self-healing through inhibitor release, and phenanthroline-modified particles (ZPH) acting as sensors for Fe²⁺ ion detection.
The coating demonstrated superhydrophobic properties with contact angles up to 157°. Electrochemical impedance spectroscopy revealed that the EPV/ZBT/ZPH system exhibited the highest coating resistance and charge transfer resistance, maintaining its protective effect even after 192 hours of immersion in 3.5 wt% NaCl solution. Furthermore, the ZPH-modified particles allowed for visual feedback, forming a red complex in the presence of Fe²⁺ ions and thus enabling early detection of corrosion.
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The benzotriazole loading ensured that the coating could repair itself under corrosive conditions through pH-responsive inhibitor release. Scanning Kelvin probe (SKP) studies confirmed that the addition of ZBT and ZPH particles significantly improved the delamination resistance compared with conventional systems.
By integrating corrosion protection, self-healing and visual self-reporting, this coating concept provides a multifunctional approach well suited for demanding industrial environments where both durability and condition monitoring are critical.
Source: Chavhan, J. et al., Multifunctional Epoxy/PVDF smart coatings using ZIF-8 nanosensor for corrosion protection of mild steel: A study on synthesis and performance. Prog. Org. Coat. 203, 109198 (2025).
