Abstract The hexagonal boron nitride (h-BN) has extensive promise for metal corrosion protection due to its good impermeability to gas and liquid. However, the practical application of h-BN in polymer composites is limited by surface incompatibility. Herein, we prepared a homogeneous dispersion of h-BN in water-borne epoxy (EP) matrix by mechanical exfoliation and chemical modification, in which the h-BN powder was ultrasonic to obtain partially hydroxylated BN and the products were modified with water-soluble branched poly-ethyleneimine (PEI) via Lewis acid-base interaction. The electrochemical test (EIS and potentiodynamic polarization) and salt spray test in NaCl solution were used to analyze the corrosion resistance performance of composite coatings. The results show that PEI-BNNS/EP coating has superior and long-term anticorrosion performance for P110 mild steel. The impedance modulus (Zf = 0.01 Hz) of PEI-BNNS/EP still has 6.63 × 107 Ω cm2 after 70 days immersion in the 3.5 wt. % NaCl solution. The PEI has an important role for enhancing the anticorrosion property of PEI-BNNS/EP coating, which increases the dispersibility and compatibility of h-BN in EP and the crosslink density of epoxy resin. Our study gives a strategy for the preparation of easy dispersion h-BN nanosheets in large quantities, thus broadening its practical application in the polymer material field.

中文翻译：

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通过机械剥离和 PEI 化学改性对 h-BN 进行协同功能化以提高水性环氧涂料的耐腐蚀性

摘要 六方氮化硼（h-BN）由于其良好的气体和液体不渗透性，在金属腐蚀防护方面具有广泛的应用前景。然而，h-BN在聚合物复合材料中的实际应用受到表面不相容性的限制。在本文中，我们通过机械剥离和化学改性制备了 h-BN 在水性环氧树脂 (EP) 基体中的均匀分散体，其中 h-BN 粉末经超声获得部分羟基化的 BN，并用水溶性对产物进行改性。通过路易斯酸碱相互作用的支化聚乙烯亚胺（PEI）。采用电化学测试（EIS和动电位极化）和NaCl溶液中的盐雾试验分析复合涂层的耐腐蚀性能。结果表明，PEI-BNNS/EP涂层对P110低碳钢具有优异的长期防腐性能。PEI-BNNS/EP 的阻抗模量 (Zf = 0.01 Hz) 在 3.5 wt. 浸入 70 天后仍为 6.63 × 107 Ω cm2。% NaCl 溶液。PEI对于增强PEI-BNNS/EP涂层的防腐性能有重要作用，它增加了h-BN在EP中的分散性和相容性以及环氧树脂的交联密度。我们的研究为大量制备易分散的 h-BN 纳米片提供了一种策略，从而拓宽了其在聚合物材料领域的实际应用。PEI对于增强PEI-BNNS/EP涂层的防腐性能有重要作用，它增加了h-BN在EP中的分散性和相容性以及环氧树脂的交联密度。我们的研究为大量制备易分散的 h-BN 纳米片提供了一种策略，从而拓宽了其在聚合物材料领域的实际应用。PEI对于增强PEI-BNNS/EP涂层的防腐性能有重要作用，它增加了h-BN在EP中的分散性和相容性以及环氧树脂的交联密度。我们的研究为大量制备易分散的 h-BN 纳米片提供了一种策略，从而拓宽了其在聚合物材料领域的实际应用。