通过调控表面石墨烯-环氧树脂复合涂层的仿生界面和取向以提高镁合金的防腐和热/电性能

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中文摘要：通过旋涂方法制备具有"砖泥"结构的仿生石墨烯-环氧树脂复合涂层.合成咪唑基离子液体修饰的石墨烯(GI)以改善石墨烯(G)和环氧树脂之间的界面相容性.通过扫描电镜、拉曼光谱、X射线光电子能谱和傅里叶变换红外光谱观察和分析其表面形貌和化学结构,利用热成像仪记录表面温度变化,通过体积表面积电阻率测试仪和激光闪点法分别测定涂层的表面电阻率和导热系数,通过电化学阻抗谱和盐雾腐蚀试验表征其耐蚀性.复合涂层中的GI层呈现出近似平行的取向,从而提高热传导和静电耗散效率.穿过平面的导热系数和表面电阻率分别为0.77W·m-1·K-1和1.6×106 Ω·cm.电化学阻抗谱测试表明,经过40 d的浸泡,涂层的低频模量达到6.76×1010Ω·cm2,比纯环氧涂层提高约2个数量级,表现出优异的耐腐蚀性.

外文标题：Superior corrosion resistance and thermal/electro properties of graphene-epoxy composite coating on Mg alloy with biomimetic interface and orientation

外文摘要：Biomimetic graphene-epoxy composite coating was fabricated with a"brick and mud"structure via a spin-coating strategy.Imidazolium-based ionic liquids modified graphene(GI)was synthesized to improve the interfacial compatibility between the graphene(G)layers and epoxy resin.The surface morphology and chemical structures were observed and analyzed through scanning electron microscopy(FE-SEM),Raman spectroscopy,and X-ray photoelectron spectroscopy(XPS)as well as Fourier transform infrared spectroscopy(FTIR).The thermal imager was used to record the temperature change on the surface.The surface resistivity and thermal conductivity of the coating were determined via volumetric surface area resistivity tester and laser flash method,respectively.The corrosion resistance was investigated through electrochemical impedance spectroscopy(EIS)and salt spray testing.The GI layers in the composite coating exhibited a near-parallel orientation,which led to improved heat transfer and electrostatic dissipative efficiency.The through-plane thermal conductivity and surface resistivity were 0.77 W·m-1·K-1 and 1.6×106Ω·cm,respectively.Electrochemical impedance spectroscopy tests revealed that the low-frequency modulus of the coating reached 6.76×1010 Ω·cm2 after 40 d of immersion,which was about two orders of the magnitude higher than that of the pure epoxy coating,showing a superior corrosion resistance.

外文关键词：

biomimetic structurecomposite coatingmagnesium alloygraphene orientationcorrosion resistance

作者：

隋普升、刘成宝、张爱猛、孙聪、崔蓝月、曾荣昌

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作者单位：

山东科技大学材料科学与工程学院,青岛 266590

郑州大学材料科学与工程学院,郑州 450002

关键词：

仿生结构复合涂层镁合金石墨烯取向耐蚀性

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Shandong Province,ChinaTalent Introduction and Research Startup Fund of Shandong University of Science and Technology,China

项目编号：

5207119152201077ZR2022QE1910104060510124

出版年：

2024

DOI：

10.1016/S1003-6326(23)66388-5

中国有色金属学报(英文版)

中国有色金属学会

中国有色金属学报(英文版)

CSTPCD

影响因子：1.183

ISSN：1003-6326

年,卷(期)：2024.34(1)

参考文献量51