【作者】 邓俊英；

【导师】 侯保荣；

【作者基本信息】 中国科学院研究生院（海洋研究所） ， 海洋化学， 2010， 博士

【摘要】 本论文研究了最具有应用前景的导电聚合物—聚苯胺在防腐蚀技术中的应用。根据需求设计合成条件,得到目标产物聚苯胺。分别考察了不同条件下制备出的聚苯胺在缓蚀剂和涂层中的应用。探讨了聚苯胺缓蚀剂的缓蚀机理,分析了聚苯胺涂层浸泡过程的阻抗谱特征。以过硫酸铵做氧化剂,选用具有一定缓蚀功能和大分子结构的羧甲基壳聚糖作为掺杂酸,得到了具有一定水溶性的聚苯胺微米小球和微纳米纤维;将掺杂酸改为聚苯乙烯磺酸,进一步提高了产物聚苯胺的水溶性;改变氧化剂的种类,选用氧化电位较低的三氯化铁做氧化剂,得到了具有纳米尺寸的聚苯胺纤维。将羧甲基壳聚糖掺杂聚苯胺作为缓蚀剂添加到0.5M盐酸溶液中。分别通过失重实验,多种电化学实验和量化计算等手段测试了聚苯胺在盐酸溶液中的缓蚀效率,探讨了缓蚀机理。结果发现,与一般有机缓蚀剂相比,少量的聚苯胺就可以有效的降低碳钢在盐酸溶液中的腐蚀。使用聚苯乙烯磺酸(PSSA)作为掺杂酸得到的水溶性聚苯胺对水性环氧树脂进行改性。盐雾试验加速腐蚀后,通过极化曲线和交流阻抗测试发现,添加少量的聚苯胺就可以有效的提高涂层的防腐蚀性能。将三氯化铁作为氧化剂制备出的纳米尺寸的聚苯胺纤维对环氧树脂涂层进行改性。分别将3%和7%聚苯胺改性的环氧涂层与空白环氧涂层的防腐蚀性能进行了对比。通过交流阻抗对各涂层的浸泡过程进行了分析和对比。分析了涂层金属开路电位,阻抗谱图形状,以及采用相应的等效电路解析的阻抗谱参数随浸泡时间的变化。结果发现聚苯胺的加入促进了电极表面金属氧化膜的生成,从而提高了涂层的防护性能。更多还原

【Abstract】 Polyaniline, being popular for its potential practical applications, was studied for the application in anti-corrosion technologies in this paper. We designed the synthesis conditions attaining object polyaniline. Polyaniline which had different morphologies and characteristics was applied in corrosion inhibitor and coatings respectively. The inhibitive mechanism of polyaniline was discussed. The protective and deterioration process of coating modified by polyaniline was investigated.Polyaniline nanofibres and microspheres which had water solubility were synthesized by using Ammonium peroxydisulfate (APS) as oxidant and carboxymenthyl chitosan as doping acid. In order to enhance the water solubility of polyaniline, Polystyrene sulfonic acid (PSSA) was selected as dopant. Besides, polyaniline nanofibers were synthesized while FeCl3.6H2O which had a low oxidation potential was chosen as oxidation.Polyanilie doped by Polystyrene sulfonic acid (PSSA) was chosen to modify the water epoxy resin coating. After being accelerated corrosion in salt-fog experiment box, the characteristics of electrode was tested by Tafel polarization curve and electrochemical impedance spectroscopy (EIS). The results indicated that adding a small quality of polyanile could increase the anti-corrosion ability effectively.Epoxy resin modified by polyaniline nanofibers was prepared by using FeCl3.6H2O as dopant. Anti-corrosion abilities of epoxy resin and those modified with 3% and 7% polyaniline were compared respectively. Coating deterioration processes were researched by EIS method. EIS parameters in diferent immersing time were attained by using impedance models. In the end, the open circuit potential (OCP) and EIS of coating and iron interface were analyzed. The results obtained showed that a new layer on the iron surface had arisen. We supposed that the polianiline increased the formation of the new layer which was composed of the oxide of iron, and so the protect characteristic of polianiline modified coating increased.更多还原