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Corrosion is a significant and costly issue for engineering industries. This study describes an anticorrosion coating based on the chromium carbide MXene (Cr 2 CT x ) and polyaniline (PANI) in epoxy-polyamide matrix. The hybrid system was prepared by in-situ oxidative polymerization of aniline in the presence of few-layer Cr 2 CT x , which was dispersed in epoxy and cured with polyamide. XRD, FTIR spectroscopy, and SEM/EDS analyses demonstrated the successful combination of PANI and Cr 2 CT x nanosheets with the epoxy matrix, driven by favourable compatibility. Favourable hydrophobicity was also observed according to contact angle studies. Electrochemical studies were carried out in a 3.5 wt% NaCl solution for 60 days on an ultra-thin 10 ± 2 μm film, indicating the significantly better performance of 0.5 wt% Cr 2 CT x + 0.3 wt% PANI/epoxy coating. In this composite, the more stable OCP, a significant decrease of corrosion current density by 3.57 orders of magnitude (~3.73 × 10 3 fold), and a lower corrosion rate of 4.91 × 10 −6 mm.year −1 in comparison with neat epoxy (0.006 mm.year −1 ) and bare steel (0.018 mm·year −1 ) was achieved. The protection efficiency of the coating reached ~99.97 %, demonstrating a performance improvement of more than three orders of magnitude relative to neat epoxy. EIS fitting revealed high impedance, coating, and charge transfer resistance, and multi-time-constant protection mechanisms, while the surface examination showed fewer cracks and corrosion defects for the hybrid film. Accordingly, the highly conductive PANI and lamellar Cr 2 CT x MXene can offer long-term corrosion resistance, making Cr 2 CT x -PANI/epoxy composite a promising candidate for advanced protective coatings in chloride environments. • Cr 2 C MXene–PANI hybrid epoxy coatings were prepared for corrosion resistance. • Ultrathin film, ~10 μm, exhibited long-term a stable barrier in 3.5 wt% NaCl. • Results showed a 3.57 orders of magnitude drop in corrosion current and ~ 99.9 % PE. • EIS confirmed multi-time-constant protection with |Z| 0.01, R c and R ct > 10 5 Ω.cm 2 . • Morphology analyses suggested hydrophobicity and substrate preservation.
Askar et al. (Mon,) studied this question.