论文部分内容阅读
以硅酸乙酯(TEOS)为前驱体,通过溶胶凝胶法制备二氧化硅(SiO2)溶胶,并以乙烯基三乙氧基硅烷(VTEO)对其改性,得到改性SiO2溶胶(VTEO/SiO2);同时制备磷酸掺杂聚苯胺(PANI)接枝SiO2复合粒子(PANI/SiO2)。将改性溶胶和复合粒子均匀混合后在Q235钢表面制备了PANI/SiO2-VTEO/SiO2复合膜。利用红外光谱(FTIR)分析了改性SiO2溶胶和PANI接枝SiO2的化学结构;通过扫描电子显微镜(SEM)分析了复合膜的形貌;利用接触角测试仪测试了复合膜的疏水性能;采用电化学阻抗谱(EIS)、开路电位(OCP)、极化曲线对制备的PANI/SiO2-VTEO/SiO2复合膜进行防腐蚀性能研究。结果表明,复合膜的水接触角为150°,表现出良好的疏水性能;复合膜具有较高的电化学阻抗(5.0×106Ω)和开路电位(-0.18 V),较低腐蚀电流密度(1.18×10-8A/cm2),腐蚀速率仅为0.000 1 mm/a,表现出了良好的防腐蚀性能。
Silica (SiO2) sol was prepared by sol-gel method with TEOS as precursor and modified with vinyltriethoxysilane (VTEO) to obtain modified silica sol (VTEO / SiO2); PANI grafted SiO2 composite particles (PANI / SiO2) were also prepared. PANI / SiO2-VTEO / SiO2 composite films were prepared on the surface of Q235 steel by mixing the modified sol and the composite particles uniformly. The chemical structure of the modified SiO2 sol and PANI grafted SiO2 was analyzed by FTIR. The morphology of the composite film was analyzed by scanning electron microscopy (SEM). The hydrophobic property of the composite film was tested by the contact angle tester. Electrochemical impedance spectroscopy (EIS), open circuit potential (OCP), polarization curves of the prepared PANI / SiO2-VTEO / SiO2 composite membrane corrosion resistance. The results show that the composite membrane has a water contact angle of 150 ° and good hydrophobic property. The composite membrane has higher electrochemical impedance (5.0 × 106Ω) and open circuit potential (-0.18 V), lower corrosion current density (1.18 × 10-8A / cm2), the corrosion rate is only 0.000 1 mm / a, showing good corrosion resistance.