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通过原位化学氧化合成法制备了含不同比例纳米TiO_2的聚苯胺/TiO_2复合粉。以环氧树脂为成膜物质,采用共混的方法制备了聚苯胺/TiO_2/环氧涂层,并通过正交实验优选出了力学性能最佳的涂层配方,耐化学品性测试验证了优选配方同时具有最佳的耐蚀性。最后分别考察了优选配方涂层在含S2-及Cl-盐溶液中的耐蚀性。结果表明:合成的复合粉颗粒为纳米级,聚苯胺和TiO_2存在强烈相互作用;正交实验各因素对涂层力学性能影响的重要程度次序为:聚苯胺>TiO_2>固化温度>溶剂的量>溶剂间比例;当聚苯胺与环氧树脂质量比为1∶100、TiO_2与环氧树脂质量比为1∶100、固化温度为60℃、溶剂的量与环氧树脂质量比为5∶10、NMP与正丁醇的溶剂摩尔比为2∶1时,所得涂层力学性能及耐蚀性能最佳;涂层在65℃、3.5%(质量分数)Na Cl溶液中浸泡72 h后电化学阻抗出现极大值,在80℃、3%(质量分数)Na2S溶液中浸泡120 h仍然具有良好的耐蚀性。
Polyaniline / TiO 2 composite powders with different proportions of TiO 2 were prepared by in situ chemical oxidation. Polyaniline / TiO 2 / epoxy coatings were prepared by blending with epoxy resin as film-forming material. The best mechanical properties were obtained by orthogonal experiments. The chemical resistance of the coatings was tested by chemical resistance test The preferred formula also has the best corrosion resistance. Finally, the corrosion resistance of the preferred formulation coatings in S2- and Cl-salt solutions was investigated. The results show that the synthesized composite powders are nanoscale with strong interaction between polyaniline and TiO 2. The order of importance of each factor on the mechanical properties of coatings is: polyaniline> TiO 2> curing temperature> amount of solvent> Solvent ratio; when the mass ratio of polyaniline to epoxy resin is 1: 100, the mass ratio of TiO 2 to epoxy resin is 1: 100, the curing temperature is 60 ℃, the mass ratio of solvent to epoxy resin is 5:10, NMP and n-butanol solvent molar ratio of 2: 1, the resulting coating mechanical properties and corrosion resistance of the best; coating at 65 ℃, 3.5% (mass fraction) NaCl solution for 72 h after immersion electrochemical impedance The maximum value appears, soaking in 80% 3% (mass fraction) Na2S solution for 120 h still has good corrosion resistance.