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Fabrication of ZnO/rGO and ZnO/MWCNT nanohybrids to reinforce the anticorrosion performance of polyurethane coating
FlatChem ( IF 5.9 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.flatc.2020.100208
Kamalon Rajitha , Kikkeri Narasimha Shetty Mohana , Mahesh Bhaskar Hegde , Saurav Ramesh Nayak , Ningappa Kumara Swamy

Abstract Polyurethane (PU) has been widely utilized in different applications due to its unique properties. Substantial attempts have been made to enhance the corrosion resistance and mechanical properties of PU coating through the addition of nanomaterials. In this study, zinc oxide/reduced graphene oxide (ZnO/rGO) and zinc oxide/multiwalled carbon nanotube (ZnO/MWCNT) nanohybrids were synthesized and incorporated into the PU matrix to enhance the anti-corrosion property of the PU coating. The synthesized nanofillers were thoroughly characterized through Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), Raman spectroscopy, Field Emission Scanning Electron Microscopy (FE-SEM) and Energy Dispersive X-ray spectroscopy (EDX). The rGO/ZnO-PU and MWCNT/ZnO-PU nanocomposites, and also neat PU were coated on the mild steel (MS) substrate, and the surfaces of the coated samples were probed by Contact angle technique, Atomic Force Microscopy (AFM), and SEM analysis. Electrochemical impedance spectroscopy and potentiodynamic polarization tests were carried out to examine the effects of rGO/ZnO and CNT/ZnO nanofillers in improving the protection and barrier properties of pure PU coating. Electrochemical corrosion data revealed the superior anticorrosion efficiency for rGO/ZnO decorated PU coating (99.09%) compared to that of MWCNT/ZnO dispersed PU coating (95.24%). The high surface area and aspect ratio of rGO make it an effective nanofiller in reinforcing the PU matrix for anticorrosion application.

中文翻译:

制备 ZnO/rGO 和 ZnO/MWCNT 纳米杂化物以增强聚氨酯涂层的防腐性能

摘要 聚氨酯(PU)由于其独特的性能而被广泛应用于不同的领域。已经进行了大量尝试,通过添加纳米材料来提高 PU 涂层的耐腐蚀性和机械性能。在这项研究中,氧化锌/还原氧化石墨烯(ZnO/rGO)和氧化锌/多壁碳纳米管(ZnO/MWCNT)纳米杂化物被合成并掺入PU基体中以增强PU涂层的防腐性能。通过傅里叶变换红外光谱 (FT-IR)、X 射线衍射 (XRD)、拉曼光谱、场发射扫描电子显微镜 (FE-SEM) 和能量色散 X 射线光谱 (EDX) 对合成的纳米填料进行了彻底表征。rGO/ZnO-PU 和 MWCNT/ZnO-PU 纳米复合材料,在低碳钢 (MS) 基材上涂覆纯 PU,并通过接触角技术、原子力显微镜 (AFM) 和 SEM 分析探测涂覆样品的表面。进行了电化学阻抗谱和动电位极化测试,以检查 rGO/ZnO 和 CNT/ZnO 纳米填料对提高纯 PU 涂层的保护和阻隔性能的影响。电化学腐蚀数据显示,与 MWCNT/ZnO 分散的 PU 涂层(95.24%)相比,rGO/ZnO 装饰的 PU 涂层(99.09%)具有更高的防腐效率。rGO 的高表面积和纵横比使其成为一种有效的纳米填料,可增强用于防腐应用的 PU 基体。和 SEM 分析。进行了电化学阻抗谱和动电位极化测试,以检查 rGO/ZnO 和 CNT/ZnO 纳米填料对提高纯 PU 涂层的保护和阻隔性能的影响。电化学腐蚀数据显示,与 MWCNT/ZnO 分散的 PU 涂层(95.24%)相比,rGO/ZnO 装饰的 PU 涂层(99.09%)具有更高的防腐效率。rGO 的高表面积和纵横比使其成为一种有效的纳米填料,可增强用于防腐应用的 PU 基体。和 SEM 分析。进行了电化学阻抗谱和动电位极化测试,以检查 rGO/ZnO 和 CNT/ZnO 纳米填料对提高纯 PU 涂层的保护和阻隔性能的影响。电化学腐蚀数据显示,与 MWCNT/ZnO 分散的 PU 涂层(95.24%)相比,rGO/ZnO 装饰的 PU 涂层(99.09%)具有更高的防腐效率。rGO 的高表面积和纵横比使其成为一种有效的纳米填料,可增强用于防腐应用的 PU 基体。电化学腐蚀数据显示,与 MWCNT/ZnO 分散的 PU 涂层(95.24%)相比,rGO/ZnO 装饰的 PU 涂层(99.09%)具有更高的防腐效率。rGO 的高表面积和纵横比使其成为一种有效的纳米填料,可增强用于防腐应用的 PU 基体。电化学腐蚀数据显示,与 MWCNT/ZnO 分散的 PU 涂层(95.24%)相比,rGO/ZnO 装饰的 PU 涂层(99.09%)具有更高的防腐效率。rGO 的高表面积和纵横比使其成为一种有效的纳米填料,可增强用于防腐应用的 PU 基体。
更新日期:2020-11-01
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