Al2O3/有机硅/SiO2杂化涂层电化学阻抗谱研究

以正硅酸乙酯 (TEOS)、甲基三乙氧基硅烷 (MTES)、二苯基二甲氧基硅烷 (DDS) 和仲丁醇铝 (ASB) 为主要原料，采用溶胶-凝胶法得到Al₂O₃/有机硅/SiO₂杂化溶胶，经100 ℃下固化12 h后得到Al₂O₃/有机硅/SiO₂杂化涂层。红外光谱研究表明，杂化涂层中形成了Al—O—Si键。采用电化学阻抗 (EIS) 研究杂化涂层在3.5%NaCl溶液中浸泡不同时间的阻抗行为，根据阻抗谱特征建立了等效电路图，结合等效电路图和拟合结果分析了杂化涂层在3.5%NaCl溶液中浸泡不同时间的耐蚀性。结果表明，其在3.5%NaCl溶液中具有良好的耐蚀性。

Electrochemical Impedance Spectroscopy of an Al2O3/Organosilicone/SiO2 Hybrid Coating

Al₂O₃/organosilicone/SiO₂ hybrid sol was prepared by the method of sol-gel with tetraethyl orthosilicate (TEOS), methyl triethoxysilane (MTES), diphenyl dimethoxy silane (DDS) and aluminium tri-sec-butoxide as raw materials. Then a hybrid coating was obtained by drying at 100 ℃ for 12 h. The result of Fourier transform infrared spectroscopy (FT-IR) showed that the Al—O—Si bond was formed in the Al₂O₃/organosilicone/SiO₂ hybrid materials. The electrochemical impedance spectroscopy (EIS) of the coating immersed in 3.5%NaCl solution for different times was studied. The equivalent circuits were established according to the impedance spectral characteristics. The corrosion resistance of the hybrid coating was discussed based on the equivalent circuit and fitted results of electrochemical impedance spectroscopy. The results indicated that the corrosion resistance of the Al₂O₃/organosilicone/SiO₂ hybrid coating was excellent in 3.5%NaCl solution.