中文摘要：

以过硫酸铵为氧化剂，磺基水杨酸为掺杂剂，用化学氧化法合成了聚苯胺-二氧化硅（PANI—SiO2）复合材料；通过FTIR，XRD和SEM对PANI—SiO2复合材料进行表征；以PANI—SiO2粉末为功能成分，环氧树脂为成膜物质，在镁锂合金表面制备了PANI—SiO2／环氧树脂复合涂层，用开路电位和交流阻抗谱研究了涂层的防腐蚀性能．结果表明，在3．0mass％的NaCl溶液中，PANI-SiO2／环氧树脂复合涂层具有很好的防腐性能，且认为PANI的存在使得镁锂合金表面生成一层钝化膜．

英文摘要：

Polyaniline-SiO2 composites（ PANI-SiO2 ）were prepared by means of chemical oxidation ot aniline with ammonium persulphate in sulfosalicylic acid medium. The PANI-SiO2 was characterized by FTIR,XRD and SEM methods. A coating consisted of PANI-SiO2 and epoxy resin（EP） was prepared on Mg- Li alloy, and its anti-corrosion properties were investigated by open circuit potential and electrochemical impedance spectroscopy. The results indicated that the PANI-SiO2 containing coating showed good anti- corrosion property in 3.0 mass% NaCl solution. The excellent performance of PANI-SiO2 containing coating is attributed to the passivation of Mg-Li alloy by polyaniline.