Polyaniline (PANI)-based coatings show attracting anticorrosion ability for metals and alloys. However, fabrication of high performance, durable, and cheap PANI-based anticorrosion coatings is still a challenge. Herein, we report that the anticorrosion performance of PANI can be significantly improved by construction of superhydrophobic surface and optimizing pore size, both of which are simultaneously realized through compositing PANI with biomass-derived porous carbon (PC). The anticorrosion durability of PANI/PC coating on Fe foil in 3.5 wt% NaCl solution can last for more than a month, which is over two times longer than bare PANI coating. Combining experimental measurements and theoretical calculations, it is revealed that both superhydrophobic surface and optimizing pore size concurrently contribute to the high anticorrosion performance of PANI/PC coating. The superhydrophobic property of the coating enhances the resistance for water penetration and the micropore character of the coating increases the traverse resistance of corrosion mediums such as Na⁺ and Cl^- ions when transport the coating. This work highlights that the anticorrosion life of PANI-based coatings can be prolonged through synergistic surface- and pore-engineering.

中文翻译：

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构建超疏水表面并优化孔径以增强聚苯胺基涂料的防腐能力


基于聚苯胺 （PANI） 的涂料对金属和合金显示出吸引人的防腐蚀能力。然而，制造高性能、耐用且廉价的 PANI 基防腐涂料仍然是一个挑战。在此，我们报道了通过构建超疏水表面和优化孔径可以显着提高 PANI 的防腐性能，这两者都是通过将 PANI 与生物质衍生的多孔碳 （PC） 合成同时实现的。在 3.5 wt% NaCl 溶液中，PANI/PC 涂层在 Fe 箔上的防腐耐久性可以持续一个月以上，是裸露 PANI 涂层的两倍多。结合实验测量和理论计算，揭示了超疏水表面和优化孔径同时有助于 PANI/PC 涂层的高防腐性能。涂层的超疏水性能增强了对水渗透的抵抗力，涂层的微孔特性增加了在运输涂层时对腐蚀介质（如 Na⁺ 和 Cl^- 离子）的抗遍历性。这项工作强调，通过协同表面和孔隙工程，可以延长 PANI 基涂料的防腐寿命。