Wei Wenchang, Liu Zheng, Wei Runzhi, Han Guo-Cheng, Liang Chuxin
College of Chemical and Biological Engineering, Guilin University of Technology, Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials Guilin 541004 P.R. China
School of Life and Environmental Sciences, Guilin University of Electronic Technology Guilin 541004 P.R. China
RSC Adv. 2020 Aug 13;10(50):29923-29934. doi: 10.1039/d0ra05690a. eCollection 2020 Aug 10.
Two unreported metal-organic frameworks [Cu(6-Me-2,3-pydc)(1,10-phen)·7HO] (namely Cu-MOF) and [Mn(2,2'-bca)(HO)] (namely Mn-MOF) were synthesized by a solvothermal method and their structures were characterized and confirmed by elemental analysis, X-ray single crystal diffraction, Fourier infrared spectroscopy and thermogravimetric analysis. Cu-MOF/graphene (Cu-MOF/GR), Cu-MOF/graphene oxide (Cu-MOF/GO), Mn-MOF/graphene (Mn-MOF/GR) and Mn-MOF/graphene oxide (Mn-MOF/GO) composite materials were successfully synthesized by a solvothermal method and characterized and analyzed by PXRD, SEM and TEM. In order to study the corrosion inhibition properties of the Cu-MOF/GR, Cu-MOF/GO, Mn-MOF/GR and Mn-MOF/GO composite materials on carbon steel, they were mixed with waterborne acrylic varnish to prepare a series of composite coatings to explore in 3.5 wt% NaCl solution by electrochemical measurements and results showed that the total polarization resistance of the 3% Cu-MOF/GO and 3% Mn-MOF/GO composite coatings on the carbon steel surface were relatively large, and were 55 097 and 55 729 Ω cm, respectively, which could effectively protect the carbon steel from corrosion. After immersion for 30 days, the 3% Mn-MOF/GO composite still maintained high corrosion resistance, the || values were still as high as 23 804 Ω cm. Therefore, MOFs compounded with GO can produce a synergistic corrosion inhibition effect and improve the corrosion resistance of the coating; this conclusion is well confirmed by the adhesion capability test.
通过溶剂热法合成了两种未见报道的金属有机框架材料[Cu(6-Me-2,3-pydc)(1,10-phen)·7H₂O]（即Cu-MOF）和[Mn(2,2'-bca)(H₂O)]（即Mn-MOF），并通过元素分析、X射线单晶衍射、傅里叶红外光谱和热重分析对其结构进行了表征和确认。通过溶剂热法成功合成了Cu-MOF/石墨烯（Cu-MOF/GR）、Cu-MOF/氧化石墨烯（Cu-MOF/GO）、Mn-MOF/石墨烯（Mn-MOF/GR）和Mn-MOF/氧化石墨烯（Mn-MOF/GO）复合材料，并通过粉末X射线衍射、扫描电子显微镜和透射电子显微镜对其进行了表征和分析。为了研究Cu-MOF/GR、Cu-MOF/GO、Mn-MOF/GR和Mn-MOF/GO复合材料对碳钢的缓蚀性能，将它们与水性丙烯酸清漆混合制备了一系列复合涂层，通过电化学测量在3.5 wt% NaCl溶液中进行探索，结果表明碳钢表面3% Cu-MOF/GO和3% Mn-MOF/GO复合涂层的总极化电阻相对较大，分别为55097和55729 Ω·cm²，能够有效保护碳钢免受腐蚀。浸泡30天后，3% Mn-MOF/GO复合材料仍保持高耐蚀性，|Rct|值仍高达23804 Ω·cm²。因此，MOF与GO复合可产生协同缓蚀效应，提高涂层的耐蚀性；附着力测试很好地证实了这一结论。
