【摘要】 用γ-（2,3-环氧丙氧）丙基三甲氧基硅烷（GPTMS）对纳米二氧化硅（SiO₂）表面进行修饰,再引入苯胺合成了化学键合的核壳型聚苯胺（PANI）接枝SiO₂（SiO₂@PANI）溶胶;经乙烯基三甲氧基硅烷（VTMS）原位包埋后得到可直接涂在镁锂合金（Mg-Li）表面的SiO₂@PANI/VTMS水性溶胶。使用红外光谱（FT-IR）、X射线粉末衍射（XRD）、X射线光电子能谱（XPS）、透射电子显微镜（TEM）等手段表征了SiO₂@PANI粒子的结构与形貌;测量极化曲线和电化学阻抗（EIS）表征了SiO₂@PANI/VTMS涂层对Mg-Li合金的防腐蚀性能;讨论了苯胺用量和VTMS用量对SiO₂@PANI的粒径、涂层疏水性以及防腐蚀性能的影响,给出了可能的防腐蚀机理。结果表明,m（An）:m（TEOS）=7:100、m（VTMS）:m（TEOS）=4:4的SiO₂@PANI/VTMS涂层对Mg-Li合金具有优异的防腐蚀性能,涂层水接触角高达145.5°,电化学阻抗值达到7.5×104Ω·cm²,腐蚀电流密度仅为4.47×10-8A/cm2。更多还原

【Abstract】 Nano-SiO₂ was firstly modified by（3-glycidoxypropyl）-trimethoxylsilane（GPTMS）, and then was grafted with polyaniline（PANI） to form nano-SiO₂（SiO₂@PANI） sol with core-shell structure through chemical bonding. Further, the nano-SiO₂（SiO₂@PANI） sol was in situ embedded with vinyl trimethoxysilane（VTMS） to prepare the water-born SiO₂@PANI/VTMS sol, which can be used as coating material for Mg-Li alloy. The structure and morphology of SiO₂@PANI were characterized by Fourier transform infrared spectrum（FT-IR）, X-ray diffractometer（XRD）, X-ray photoelectron spectroscopy（XPS） and transmission electron microscopy（TEM） etc. The corrosion resistance of the coating was assessed by potentiodynamic polarization curves and electrochemical impedance spectra（EIS）. The effect of anilineand VTMS-dosage on the particle size, hydrophobic property and corrosion resistance of SiO₂@PANI were also examined, and the possible anticorrosion mechanism was proposed. The results show that the SiO₂@PANI/VTMS coatings have a high hydrophobic angle, which could reach 145.5° when m（An）:m（TEOS）=7:100 and m（VTMS）:m（TEOS）=4:4. The composite coatings on Mg-Li alloy present excellent corrosion resistance performance with electrochemical impedance value 7.5 × 104Ω·cm2 and corrosion current density 4.47×10-8 A/cm².更多还原