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Sandwich-structured rGO/PVDF/PU multilayer coatings for anti-corrosion application

机译：夹层结构的rGO / PVDF / PU多层防腐涂料

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In this study, we fabricated a novel sandwich structure by combining reduced graphene oxide (rGO), polyvinylidene difluoride (PVDF) and polyurethanes (PU) to construct a composite film for anti-corrosion applications. The corrosion performances of the rGO/PVDF/PU multi-layered coatings on carbon steel were evaluated in 30 wt% boiling sulfuric acid solution for 1?h and 3.5 wt% NaCl electrolyte for electrochemical tests. The results show that the addition of PU and rGO dramatically improves the anti-corrosion performance of the bare PVDF coating and the optimized content of rGO is 7 wt%. The anticorrosion performances of corrosion potential, corrosion current and protection efficiency after protection coating are measured to be ?757 mV, 0.1 μA cm?2 and 99%, respectively. The excellent results obtained could be explained by barrier effects, where the hydrophobic property and high-aspect-ratio of rGO in the PVDF matrix inhibit corrosion factors from diffusing into the substrate.
机译：在这项研究中，我们通过结合还原氧化石墨烯（rGO），聚偏二氟乙烯（PVDF）和聚氨酯（PU）制成了一种新型的三明治结构，从而构建了一种用于防腐应用的复合膜。碳钢上的rGO / PVDF / PU多层涂层的腐蚀性能在30％（重量）的沸腾硫酸溶液中浸泡1？h，3.5％（NaCl）的电解液用于电化学测试。结果表明，添加PU和rGO可以显着提高PVDF裸露涂层的防腐性能，rGO的最佳含量为7 wt％。测得防护涂层的腐蚀电位，腐蚀电流和保护效率的防腐性能分别为757 mV，0.1μAcm ？2 和99％。获得的出色结果可以通过阻挡效应来解释，其中PVDF基质中rGO的疏水性和高长宽比可抑制腐蚀因子扩散到基底中。

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