SBA-15改性氧化石墨烯的环氧复合涂层制备及其防腐性能
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摘要
用γ-氨丙基三乙氧基硅烷(KH-550)将SBA-15分子筛接枝到氧化石墨烯上制备功能填料,并将其填充到水性环氧树脂中制备复合涂层。采用FTIR、XRD、氮气吸附脱附和TEM对填料进行了表征;采用电化学阻抗谱(EIS)、盐雾实验和附着力测试等方法对不同填料添加量涂层的防腐性能及力学性能进行了表征。实验结果表明:当功能填料添加质量分数为1.0%(占体系总质量)时,涂层电化学阻抗值达到4×10~8Ω·cm~2,同时具有最佳耐盐雾性能以及附着力性能。复合涂层的防腐性能明显优于纯环氧涂层,这主要是因为功能填料的孔/片协同结构有效地延缓了腐蚀粒子到达金属基材表面的时间。
Functional filler was prepared by grafting SBA-15 molecular sieve onto graphene oxide withγ-aminopropyltriethoxysilane(KH-550) and then filling it into a water-based epoxy resin to prepare a composite coating. The filler was characterized by FTIR, XRD, nitrogen adsorption–desorption isotherm and TEM. The corrosion resistance and mechanical properties of the coatings with different amount of filler were characterized by electrochemical impedance spectroscopy(EIS), salt spray test and adhesion test. The experimental results showed that when adding 1.0% functional filler(based on the total mass of system),the composite coating showed the highest impedance value of 4×10~8 ??cm~2, and had the best salt spray resistance and adhesion performance. The anticorrosive property of the composite coating was superior to that of pure epoxy coating, which was mainly because the hole/sheet synergistic structure of the functional filler effectively delayed the time of the corrosion particles reaching the surface of the metal substrate.
Functional filler was prepared by grafting SBA-15 molecular sieve onto graphene oxide withγ-aminopropyltriethoxysilane(KH-550) and then filling it into a water-based epoxy resin to prepare a composite coating. The filler was characterized by FTIR, XRD, nitrogen adsorption–desorption isotherm and TEM. The corrosion resistance and mechanical properties of the coatings with different amount of filler were characterized by electrochemical impedance spectroscopy(EIS), salt spray test and adhesion test. The experimental results showed that when adding 1.0% functional filler(based on the total mass of system),the composite coating showed the highest impedance value of 4×10~8 ??cm~2, and had the best salt spray resistance and adhesion performance. The anticorrosive property of the composite coating was superior to that of pure epoxy coating, which was mainly because the hole/sheet synergistic structure of the functional filler effectively delayed the time of the corrosion particles reaching the surface of the metal substrate.
引文
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[9]Li J,Cui J,Yang J,et al.Silanized graphene oxide reinforced organofunctional silane composite coatings for corrosion protection[J].Progress in Organic Coatings,2016,99:443-451.
[10]Balaskas A C,Kartsonakis I A,Tziveleka L A,et al.Improvement of anti-corrosive properties of epoxy-coated AA 2024-T3 with TiO2nanocontainers loaded with 8-hydroxyquinoline[J].Progress in Organic Coatings,2012,74(3):418-426.
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[15]Li Z,González A J,Heeralal V B,et al.Covalent assembly of MCM-41 nanospheres on graphene oxide for improving fire retardancy and mechanical property of epoxy resin[J].Compos,Part B:Eng,2017,138:101-112.
[16]Wang N,Zhang M,Kang P,et al.Synergistic effect of graphene oxide and mesoporous structure on flame retardancy of nature Rubber/IFR composites[J].Materials,2018,11(6):1005-1018.
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[19]Wang X,Lin K S,Chan J C,et al.Direct synthesis and catalytic applications of ordered large pore aminopropyl-functionalized SBA-15 mesoporous materials[J].Journal of Physical Chemistry B,2005,109(5):1763-1769.
[20]Zhai Qingzhou(翟庆洲),Wang Qi(王琪),Zhang Xiaoxia(张晓霞).Preparation and characterization of methylated SBA-15 molecular sieves[J].Journal of the Chinese Ceramic Society(硅酸盐学报),2009,37(4):531-535.
[21]Zhu Huayue(朱华跃),Xiao Ling(肖玲).Moist heat treatment and analysis of both FTIR spectra and XRD spectra of chitosan-gelatin blend films[J].Journal of Zhejiang Ocean University:Natural Science(浙江海洋学院学报:自然科学版),2006,(3):301-304.
[22]And M K,Jaroniec M,Kochang H,et al.Characterization of the porous structure of SBA-15[J].Biomed Research International,2000,12(7):945-953.
[23]Zhang J T,Hu J M,Zhang J Q,et al.Studies of water transport behavior and impedance models of epoxy-coated metals in Na Cl solution by EIS[J].Progress in Organic Coatings,2004,51(2):145-151.
[24]Shinde V P.Study of water transport characteristics of poly(oethylaniline)coatings:Corrosion mechanism[J].Ionics,2017,24(2):1-11.
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[26]Wang N,Cheng K,Wu H,et al.Effect of nano-sized mesoporous silica MCM-41 and MMT on corrosion properties of epoxy coating[J].Progress in Organic Coatings,2012,75(4):386-391.
[27]Erfaghi H,Farzam M,Zaarei D,et al.The effect of MIO pigments on corrosion resistance and adhesion of synthetic rubber-based primer[J].Journal of Coatings Technology&Research,2017,15(7):1-12.