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High-compact MXene-based coatings by controllable interfacial structures.

Jiheng Ding1, Hao Wang1,2, Hongran Zhao1,3

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Ordered MXene/epoxy composite (OMC) coatings demonstrate superior anticorrosion performance by optimizing interface structures. This strategy enhances coating compactness and stability, offering long-term protection against corrosion.

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Area of Science:

  • Materials Science
  • Corrosion Science
  • Nanotechnology

Background:

  • Titanium carbide (Ti3C2Tx) MXenes are key fillers for organic anticorrosion coatings.
  • Existing MXene coatings suffer from reliability issues due to disordered interfaces.
  • The influence of interface structure on coating performance is underexplored.

Purpose of the Study:

  • To investigate the anticorrosion performance of ordered MXene/epoxy composite (OMC) coatings.
  • To elucidate the role of ordered interfacial structures in enhancing protective properties.
  • To explore the galvanic corrosion effects of MXenes in epoxy coatings.

Main Methods:

  • Fabrication of ordered MXene/epoxy composite coatings using an interface strategy.
  • Electrochemical impedance spectroscopy (EIS) to evaluate coating performance.
  • Analysis of coating compactness, porosity, and specific impedance (SZ).
  • Systematic exploration of MXene galvanic corrosion effects.

Main Results:

  • OMC coatings exhibit exceptional anticorrosion performance with high impedance (6.84 × 10^9 Ohm cm^2) and coating resistance (6.08 × 10^9 Ohm cm^2).
  • Achieved extremely low porosity (0.77%) and breakpoint frequency (0.18 Hz) at 0.5 wt% filler content.
  • The ordered structure enhances compactness and minimizes aggressive species infiltration.
  • Galvanic corrosion effects of MXenes were systematically explored and mitigated by the ordered structure.

Conclusions:

  • Ordered interfacial structures significantly enhance the anticorrosion performance of MXene/epoxy coatings.
  • The OMC coating strategy offers superior long-term protection by eliminating corrosion promotion activity.
  • This work provides a new approach for developing advanced MXene-based anticorrosion coatings via interface engineering.