A novel sandwich-like structure material was exploited for the fabrication of an effective corrosion resistance system. An environmentally friendly composite material was synthesized by installing 8-hydroxyquinoline (8-HQ) on the surface of graphene oxide (GO). In order to prevent leakage of corrosion inhibitor 8-HQ, GO/8-HQ was modified by polydopamine (PDA), denoted as GO/8-HQ/PDA. A sandwich-like structure (GO/8-HQ/PDA) enables long-term stable storage of corrosion inhibitor in the protective matrix. Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) were utilized to verify the sandwich-like structure of GO/8-HQ/PDA. The electrochemical tests in a 3.5 wt% NaCl solution showed that the addition of well-dispersed GO/8-HQ/PDA into epoxy system (GO/8-HQ/PDA-EP) remarkably improved corrosion protection of AZ31b magnesium alloy compared with pure epoxy (EP) coating. The sandwich structure protects the activity and structural integrity of the corrosion inhibitor (8-HQ). The corrosion inhibitor (8-HQ) of the GO/8-HQ/PDA sandwich structure cuts off the ion exchange between the metal alloy and the electrolyte solution, which hinders the electrochemical corrosion of the metal. A possible corrosion resistance mechanism of GO/8-HQ/PDA is fully discussed. This study provides feasibilities for the immobilization of corrosion inhibitors on the metal surface.

中文翻译：

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聚多巴胺和8-羟基喹啉涂层的氧化石墨烯的三明治状结构，使环氧涂料具有出色的耐腐蚀性。

一种新型的三明治状结构材料被用于制造有效的抗腐蚀系统。通过在氧化石墨烯（GO）的表面上安装8-羟基喹啉（8-HQ）来合成环保复合材料。为了防止腐蚀抑制剂8-HQ泄漏，GO / 8-HQ用聚多巴胺（PDA）改性，表示为GO / 8-HQ / PDA。三明治状结构（GO / 8-HQ / PDA）可使腐蚀抑制剂长期稳定地保存在保护基质中。利用傅里叶变换红外光谱（FTIR），X射线光电子能谱（XPS）和扫描电子显微镜（SEM）来验证GO / 8-HQ / PDA的三明治结构。电化学测试3。5 wt％NaCl溶液表明，与纯环氧（EP）涂层相比，向环氧体系（GO / 8-HQ / PDA-EP）中添加分散良好的GO / 8-HQ / PDA可显着改善AZ31b镁合金的防腐性能。三明治结构可保护腐蚀抑制剂（8-HQ）的活性和结构完整性。GO / 8-HQ / PDA夹层结构的缓蚀剂（8-HQ）切断了金属合金与电解质溶液之间的离子交换，从而阻碍了金属的电化学腐蚀。充分讨论了GO / 8-HQ / PDA可能的耐腐蚀机理。该研究为将腐蚀抑制剂固定在金属表面上提供了可行性。三明治结构可保护腐蚀抑制剂（8-HQ）的活性和结构完整性。GO / 8-HQ / PDA夹层结构的缓蚀剂（8-HQ）切断了金属合金与电解质溶液之间的离子交换，从而阻碍了金属的电化学腐蚀。充分讨论了GO / 8-HQ / PDA可能的耐腐蚀机理。该研究为将腐蚀抑制剂固定在金属表面上提供了可行性。三明治结构可保护腐蚀抑制剂（8-HQ）的活性和结构完整性。GO / 8-HQ / PDA夹层结构的缓蚀剂（8-HQ）切断了金属合金与电解质溶液之间的离子交换，从而阻碍了金属的电化学腐蚀。充分讨论了GO / 8-HQ / PDA可能的耐腐蚀机理。该研究为将腐蚀抑制剂固定在金属表面上提供了可行性。