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High-compact MXene-based coatings by controllable interfacial structures
Jiheng Ding1, Hao Wang1,2, Hongran Zhao1,3
1Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, P. R. China. wangjg@nimte.ac.cn.
Nanoscale
|May 2, 2023
Summary
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.
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.
