Abstract Herein, h-BN powders were sonicated in an aqueous solution of polyethylenimine (PEI) to simultaneously exfoliate and functionalize h-BN nanosheets with Lewis acid-base interaction. The structure and morphology of PEI modified h-BN nanosheets (PEI-BNNSs) were characterized by FTIR, TGA, AFM and TEM. The as-prepared PEI-BNNSs were served as anticorrosive nanofillers for waterborne epoxy (EP) coatings on Q235 carbon steel. The corrosion behaviors of EP and PEI-BNNSs/EP coating systems in 3.5 wt % NaCl aqueous solution were evaluated by electrochemical workstation. It is worth noting that the protection efficiency (PE) values of 1 wt % PEI-BNNSs/EP and 2 wt % PEI-BNNSs/EP coating systems are as high as 99.99 % compared to EP coating systems. Moreover, the impedance modulus (|Z|f = 0.01 Hz) of the 1 wt % PEI-BNNSs/EP coating system was 3–4 orders of magnitude higher than the EP coating after 90 days of immersion. The electrochemical results revealed that PEI-BNNSs can significantly enhanced the corrosion resistance of waterborne epoxy coatings.

中文翻译：

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聚乙烯亚胺辅助 h-BN 在水性介质中剥离用于水性环氧涂料的防腐增强

摘要 在此，h-BN 粉末在聚乙烯亚胺 (PEI) 的水溶液中进行超声处理，以通过路易斯酸碱相互作用同时剥离和功能化 h-BN 纳米片。通过FTIR、TGA、AFM和TEM表征了PEI改性的h-BN纳米片（PEI-BNNSs）的结构和形貌。所制备的 PEI-BNNS 用作 Q235 碳钢上水性环氧 (EP) 涂层的防腐纳米填料。通过电化学工作站评估了EP和PEI-BNNSs/EP涂层体系在3.5 wt% NaCl水溶液中的腐蚀行为。值得注意的是，与 EP 涂层系统相比，1 wt% PEI-BNNSs/EP 和 2 wt% PEI-BNNSs/EP 涂层系统的保护效率 (PE) 值高达 99.99%。此外，阻抗模量 (|Z|f = 0. 01 Hz) 的 1 wt % PEI-BNNSs/EP 涂层系统在浸泡 90 天后比 EP 涂层高 3-4 个数量级。电化学结果表明，PEI-BNNSs 可以显着提高水性环氧涂料的耐腐蚀性。