Purpose

The purpose of this study is to use polybenzoxazine (Pbz) functionalized ZrO₂ nanoparticles to synthesize polyurethane (PU)-PbZ/ZrO₂ nanocomposite. The results derived from the electrochemical impedance spectroscopy (EIS) and polarization studies indicated the superior anticorrosive activity of PU-Pbz/ZrO₂ nanocomposite coatings compared to those of plain PU coatings. The decreased corrosion current was detected on the scratch of the PU-Pbz/ZrO₂ nanocomposite-coated mild steel surface by scanning electrochemical microscopy (SECM) compared to other studied coatings. The superior anticorrosive and mechanical properties of the proposed nanocomposite coatings provide a new horizon in the development of high-performance anticorrosive coatings for various industries.

Design/methodology/approach

The Pbz functionalized ZrO₂ nanoparticles were characterized by Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive X-ray analysis (EDX) and thermogravimetric analysis (TGA) in terms of the structural, morphological and thermal properties of these coatings. A different formulation of coatings such as PU, PU-Pbz, PU-ZrO₂ and PU-Pbz/ZrO₂ were prepared and investigated for their corrosion protection performance on mild steel in natural seawater by electrochemical techniques. The surface morphological studies were done by SEM/EDX and XRD analysis.

Findings

The superior anticorrosive property of the proposed nanocomposite coatings provides a new horizon in the development of high-performance anticorrosive coatings for various industries. Addition of Pbz wrapped ZrO₂ nanoparticles into the PU coating resulted in the blockage of charge transfer at the metal/electrolyte interface, which reduced the dissolution of mild steel. It was revealed from the SEM/EDX analysis that the formation of the corrosion products at the metal/electrolyte interface behaved as the passive layer which reduced the dissolution of steel.

Originality/value

The inclusion of polybenzoxazine functionalized ZrO₂ nanoparticles to the polyurethane coating reinforces the barrier and mechanical properties of PU-Pbz/ZrO₂ nanocomposite, which is due to the synergistic effect of ZrO₂ and Pbz.

中文翻译：

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聚苯并恶嗪/ZrO2 包封聚氨酯纳米复合涂层的协同作用增强钢在海水中的阻隔性能

目的

本研究的目的是使用聚苯并恶嗪 (Pbz) 功能化的 ZrO ₂纳米粒子合成聚氨酯 (PU)-PbZ/ZrO ₂纳米复合材料。来自电化学阻抗谱 (EIS) 和极化研究的结果表明，与普通 PU 涂层相比，PU-Pbz/ZrO ₂纳米复合涂层具有优异的防腐活性。在 PU-Pbz/ZrO ₂的划痕上检测到腐蚀电流降低通过扫描电化学显微镜（SECM）与其他研究的涂层相比，纳米复合涂层的低碳钢表面。所提出的纳米复合涂层优异的防腐和机械性能为各行各业的高性能防腐涂层的开发提供了新的视野。

设计/方法/方法

通过傅里叶变换红外光谱 (FT-IR)、X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、能量色散 X 射线分析 (EDX) 和热重分析 (TGA)对 Pbz 功能化的 ZrO ₂纳米粒子进行表征在这些涂层的结构、形态和热性能方面。制备了不同配方的涂料，如 PU、PU-Pbz、PU-ZrO ₂和 PU-Pbz/ZrO ₂，并通过电化学技术研究了它们对天然海水中低碳钢的腐蚀保护性能。通过SEM/EDX和XRD分析进行表面形态研究。

发现

所提出的纳米复合涂层的优异防腐性能为各行各业的高性能防腐涂层的开发提供了新的视野。将 Pbz 包裹的 ZrO ₂纳米粒子添加到 PU 涂层中会导致金属/电解质界面处的电荷转移受阻，从而降低了低碳钢的溶解。SEM/EDX分析表明，在金属/电解质界面形成的腐蚀产物表现为钝化层，减少了钢的溶解。

原创性/价值

由于ZrO ₂和Pbz的协同作用，将聚苯并恶嗪官能化的ZrO ₂纳米颗粒加入到聚氨酯涂层中增强了PU-Pbz/ZrO ₂纳米复合材料的阻隔和机械性能。