碳钢表面聚苯胺复合防腐涂层的制备及性能研究

发布时间：2018-03-15 07:21

本文选题：聚苯胺　切入点：丙烯酸乳液　出处：《安徽工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：本论文采用化学氧化聚合法制备纳米级聚苯胺水分散液,并将其应用于碳钢板的腐蚀防护。以丙烯酸乳液或有机硅氧烷改性树脂为主要成膜物质,通过溶液共混法制备聚苯胺/丙烯酸乳液或聚苯胺/有机硅氧烷改性树脂两种复合防腐处理液,并考察了缓蚀剂的种类及其用量对聚苯胺复合防腐涂层性能的影响。考察了稳定剂AM-1.5用量、苯胺单体用量以及磷酸用量对聚苯胺水分散液合成的影响。结果表明:稳定剂AM-1.5与苯胺单体的质量比为2:1时,在研究的苯胺单体含量范围内,均能获得稳定的纳米级聚苯胺水分散液,通过激光纳米粒度仪测试结果表明其粒径均小于400nm,且粒径分布较为集中。实验得到最佳聚苯胺水分散液配比:稳定剂AM-1.5与苯胺的质量比为2:1、苯胺单体含量为1.0%以及磷酸含量为10%。采用Tafel曲线、电化学交流阻抗谱(EIS)等方法,对聚苯胺纳米复合涂层的防腐蚀性能进行研究。结果表明:(1)在聚苯胺/丙烯酸乳液复合表面处理液中,聚苯胺含量占总体系的0.40%,复合涂层的防腐性能最佳。将不同种类的缓蚀剂添加到聚苯胺/丙烯酸乳液复合表面处理液中,当偏钒酸钠含量为0.08%、氟钛酸铵含量为0.04%、钼酸钠含量为0.04%时,聚苯胺/丙烯酸乳液复合涂层的阻抗模值增加,腐蚀电流密度降低,复合涂层的防腐性能提升。(2)在聚苯胺/有机硅氧烷改性树脂复合表面处理液中,聚苯胺含量占有机硅氧烷改性树脂的1.5%时,复合涂层的防腐性能最佳。将不同种类的缓蚀剂添加到聚苯胺/有机硅氧烷改性树脂复合表面处理液中,当氟钛酸铵含量为0.04%、钼酸钠含量为0.06%时,聚苯胺/有机硅氧烷改性树脂复合涂层的阻抗模值增加,腐蚀电流密度降低,复合涂层的防腐性能提升。偏钒酸钠、植酸和单宁酸的加入降低了复合涂层的耐蚀性能。
[Abstract]:In this paper, nanometer Polyaniline aqueous dispersion was prepared by chemical oxidation polymerization, and was applied to the corrosion protection of carbon steel plate. Acrylic emulsion or organosiloxane modified resin was used as the main film-forming material. Polyaniline / acrylic emulsion or Polyaniline / organosiloxane modified resin were prepared by solution blending method. The effects of kinds of corrosion inhibitors and their dosage on the properties of Polyaniline composite anticorrosive coatings were investigated. The amount of stabilizer AM-1.5 was also investigated. The effects of the amount of aniline monomer and phosphoric acid on the synthesis of Polyaniline aqueous dispersion were studied. The results showed that when the mass ratio of the stabilizer AM-1.5 and aniline monomer was 2: 1, the content of aniline monomer was within the range of studied. Stable nanometer Polyaniline aqueous dispersion was obtained. The results of laser nanocrystalline analyzer show that the particle size is less than 400 nm, and the particle size distribution is more concentrated. The optimum ratio of AM-1.5 to aniline is 2: 1, and the content of aniline monomer is 1.0%. And the content of phosphoric acid is 10. The Tafel curve is used. The corrosion resistance of Polyaniline nanocomposite coatings was studied by electrochemical impedance spectroscopy (EIS). The results showed that: 1) in Polyaniline / acrylic emulsion composite surface treatment solution, The content of polyphenylamine is 0.40% of the total system, and the anticorrosive property of the composite coating is the best. Different kinds of corrosion inhibitors are added to the composite surface treatment solution of Polyaniline / acrylic emulsion. When the content of sodium metavanadate is 0.08, the content of ammonium fluoride is 0.04 and the content of sodium molybdate is 0.04, the impedance mode value of Polyaniline / acrylic emulsion composite coating increases and the corrosion current density decreases. In the polyaniline / organosiloxane modified resin, the content of polyphenylamine occupies 1.5% of the modified resin. When the content of ammonium fluoride is 0.04, the content of sodium molybdate is 0.06. The corrosion resistance of polyaniline / organosiloxane modified resin composite coating was decreased with the increase of impedance mode value and the decrease of corrosion current density, while the corrosion resistance of composite coating was reduced by adding sodium metavanadate, phytic acid and tannic acid.
【学位授予单位】：安徽工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG174.46

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