Preparation And Anti-Corrosion Property Of Polyaniline Nanofibers

In this paper, the optimal mixing speed and formation mechanism of polyaniline nanofibers (PANI), prepared by Rapid Mixing Method (RMM) in different doping acid systems, were study by SEM, FTIR and UV-VIS. Polyaniline nanofibers doped by dodecylbenzenesulfonate acid (DBSA) were acquired using de-doping and the second doping process. Anti-corrosion performance of Sulfuric acid, DBSA doped and de-doped PANI were study by Electrochemical Impedance Spectroscopy (EIS). The main results were as follows:1. 1000rpm was a better reaction conditions when PANI were prepared by RMM in high-intensity acid system; however, 500rpm was a preferable reaction conditions when PANI were prepared in middle-intensity acid system. In this case, products had fibrous net-work structures and high conductivities.2. By de-doping and the second doping process, different acids doped PANI nano-materials could acquired without changing the morphology.3. Both doped and de-doped PANI had anti-corrosion performance for carbon steel in 3.5% NaCl solution, but anti-corrosion capacity of the coating were decreased with the addition of PANI.4. When the PANI content was 1% in PANI/Epoxy (P/E) coating, the sulfuric acid doped PANI had better anti-corrosion performance than DBSA doped PANI or de-doped PANI; While the DBSA doped PANI had better anti-corrosion capacity than sulfuric acid doped PANI or de-doped PANI, the PANI content was 3% in P/E coating; and the de-doped PANI would have better anti-corrosion performance than sulfuric acid doped PANI or DBSA doped PANI, when the PANI content was 5% in P/E coating; but the PANI content increased to 7% in P/E coating, both sulfuric acid doped, DBSA doped and de-doped PANI had worsen anti-corrosion capacity.5. In P/E coating, the optimal content of sulfuric acid doped PANI was 0.4-0.6%.