Abstract Effective corrosion resistance and antifriction properties can prolong the durability of coatings. We demonstrate that hexagonal boron nitride (BN) nanosheets can be employed as the reinforcement in waterborne polyurethane (PU)-matrix composite coatings and lead to a significant improvement in their corrosion protection properties. The impedance modulus at 0.1 Hz dropped from 109 Ω·cm2 to 108 Ω·cm2 for 2% BN/PU coatings after 114 h immersion in 3.5 wt% NaCl electrolyte, while it dropped from 108 Ω·cm2 to 5 × 106 Ω·cm2 for neat PU coatings. The dynamic friction coefficient was decreased for 22.6% with the addition of 2 wt% BN in the PU composite coatings at 100 °C. The morphologies of the coating surfaces showed less abrasion than neat PU after the test. The major challenge of preparing BN/PU composite coatings was the dispersion of BN nanosheets in the waterborne polymer, which was solved by functionalization of BN nanosheets with hydroxyl groups.

中文翻译：

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氮化硼纳米片增强水性聚氨酯涂料，以提高耐腐蚀性和减摩性能

摘要 有效的耐腐蚀性能和减摩性能可以延长涂层的耐久性。我们证明六方氮化硼 (BN) 纳米片可用作水性聚氨酯 (PU) 基体复合涂层的增强材料，并显着改善其防腐性能。2% BN/PU 涂层在 3.5 wt% NaCl 电解液中浸泡 114 h 后，0.1 Hz 时的阻抗模量从 109 Ω·cm2 下降到 108 Ω·cm2，而从 108 Ω·cm2 下降到 5 × 106 Ω·cm2用于纯 PU 涂料。在 100 °C 时，在 PU 复合涂层中加入 2 wt% 的 BN，动摩擦系数降低了 22.6%。测试后涂层表面的形态显示出比纯 PU 更小的磨损。