硅烷偶联剂改性氧化石墨烯增强环氧树脂复合涂料的防腐性能

Epoxy resin composite coating with silane coupling agent modified graphene oxide generating effective corrosion protection

采用简单的一步水热法制备了硅烷偶联剂功能化氧化石墨烯(KGO),并将其与环氧树脂复合,制备了一种高性能的防腐涂料。采用傅里叶变换红外光谱、拉曼光谱、扫描电子显微镜和X射线衍射分析对KGO的各项性能及微观形貌进行了表征。随后通过电化学阻抗谱(EIS)和盐雾试验对添加了质量分数为0.1%、0.2%和0.3%的环氧树脂复合涂料的耐腐蚀性能进行表征。结果表明,KGO显著提高了环氧树脂复合涂层的屏蔽性能和耐腐蚀性能。环氧树脂复合涂层腐蚀电流密度由8.8×10^(-8)A·cm^(-2)最低下降到2.0×10^(-8)A·cm^(-2)。其中,0.2 KGO/EP涂层的低频阻抗模量在浓度为3.5%的NaCl溶液中浸泡72 h后仍维持在较高水平,约高出纯环氧树脂涂层2个数量级。当KGO的添加量为0.2%时,环氧树脂复合涂层具有最优异的耐腐蚀性能。

The silane coupling agent functionalized graphene oxide(KGO)was prepared using a simple one-step hydrothermal method and combined it with epoxy resin to synthesize a high-performance anticorrosive coating.KGO was characterized by Fourier transform infrared spectroscopy(FTIR),Raman spectroscopy,scanning electron microscopy(SEM)and X-ray diffraction analysis(XRD).Epoxy resin composite coatings with 0.1%,0.2%,and 0.3%KGO(KGO/EP)were prepared and their corrosion resistance was characterized by electrochemical impedance spectroscopy(EIS)and salt spray test.The results reveal that the shielding and corrosion resistance of epoxy resin composite coating are improved significantly by KGO.The corrosion current density decreases from 8.8×10^(-8)A·cm^(-2)to 2.0×10^(-8)A·cm^(-2),the impedance modulus(|Z|_(0.01 Hz))of 0.2 KGO/EP remains at a relatively high value after 72 h of immersion in 3.5%NaCl,which is about two order higher than that of GO/EP.When the mass fraction of KGO in the KGO/EP composite coating is 0.2%,the corrosion resistance of the coating is optimal.