In this work, Ti3C2 MXene, a novel two-dimensional nanosheet, was introduced to waterborne polyurethane (WPU) coatings to prepare a composite coating. First, MAX phase materials were in situ etched by HF acid and further intercalated by water molecules to obtain exfoliated single-layer MXene nanosheet. And then, composite coatings were prepared via solution-blending low addition (0–0.4 wt%) of MXene, self-prepared waterborne polyacrylate emulsion (PAE) and isocyanate hardener, applying on Q235 mild steel. Results of AFM, XRD SEM and SEM–EDS confirm that single-layer MXene nanosheets with large lateral-to-thickness ratio are successfully prepared and achieved homogenous distribution within WPU matrix. With 0.4 wt% MXene incorporated, the WPU/Ti3C2 MXene composite coatings reach a lowest corrosion current of 2.143 × 10–6 A/cm2, a decrease of one order of magnitude compared with blank WPU (1.599 × 10–5 A/cm2) and own an excellent UV-blocking property (almost block the whole UV light).

中文翻译：

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含有新型二维Ti3C2 MXene纳米片的防腐防紫外线水性聚氨酯复合涂层

在这项工作中，将新型二维纳米片 Ti3C2 MXene 引入水性聚氨酯 (WPU) 涂层以制备复合涂层。首先，MAX相材料被HF酸原位蚀刻，并进一步被水分子嵌入以获得剥离的单层MXene纳米片。然后，通过溶液混合低添加量 (0-0.4 wt%) 的 MXene、自行制备的水性聚丙烯酸酯乳液 (PAE) 和异氰酸酯硬化剂，在 Q235 低碳钢上制备复合涂层。AFM、XRD SEM 和 SEM-EDS 的结果证实，成功制备了具有大横向厚度比的单层 MXene 纳米片，并在 WPU 基质中实现了均匀分布。加入 0.4 wt% MXene 后，WPU/Ti3C2 MXene 复合涂层的最低腐蚀电流为 2.143 × 10–6 A/cm2，