Abstract
Zeolitic imidazolate frameworks-8 (ZIF-8) have recently gained attention
as nanocontainers for encapsulating corrosion inhibitors. However, two
main challenges remain unsolved, casting doubt on their suitability as
nanocontainers. The first challenge is their instability in acidic and
basic environments, leading to structural decomposition and the second
challenge is their mass diffusion limitation caused by micropore
dominance and a small aperture size of 0.34–0.42 nm, limiting the
efficient adsorption of corrosion inhibitors. To address both
challenges, in this work, ZIF-8 nanostructures were transformed into
nitrogen-doped ZIF-derived carbon-based nanocontainers (CZIF) via
carbonization. This transformation not only stabilized the structure but
also produced larger pore sizes (micro and mesopores), due to defects
formed during carbonization. Benzotriazole (BTA) corrosion inhibitors
were then encapsulated in CZIF structures to produce CZIF-BTA.
Electrochemical impedance spectroscopy (EIS) demonstrated that the
saline solution containing CZIF-BTA extract reduced the corrosion rate
of steel by 50 % compared to a blank solution. The scratched epoxy (EP)
coating containing 0.2 wt% of CZIF-BTA revealed an active inhibition
performance with ∼100 % enhancement in the total resistance value
compared to blank EP. Finally, the coating showed superior barrier
properties with the impedance at the lowest frequency value of ∼2 × 1010 Ω cm2 after 71 days of immersion.
Original language | English |
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Journal | Journal of Colloid and Interface Science |
Volume | 681 |
Pages (from-to) | 130-147 |
ISSN | 0021-9797 |
DOIs | |
Publication status | Published - 2025 |
Keywords
- Corrosion
- Coating
- MOF
- Nanocontainer
- Benzotriazole (BTA)
- pH-sensitive