Preparation Of Polyaniline Macro/Nano Structures And Its Application In Anti-corrosion Technologies

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.