Electrochemical Study of Anti-Corrosion Property of Fe3O4/Polyaniline Nanocomposite

Herein, a nanocomposite of polyaniline and Fe3O4 nanoparticles (Fe3O4/PANI) were prepared through a two-step oxidative polymerization in mass ratio of 1:1, 1:2 and 2:1. Prepared Fe3O4/PANI nanocomposites were characterized by FT-IR, XRD, TEM, SEM and EDXA. A thin layer of the Fe3O4/PANI nanocomposites were used to coating a carbon steel as corrosion inhibitor in NaCl 3.5%. Anti-corrosion performance of the Fe3O4/PANI nanocomposites wasinvestigated through electrochemical techniques such as open circuit potential (OCP), potentiodynamic polarization and electrochemical impedance (EIS). Observed results showed a dramatic shift in corrosion potential and a decrease in cathodic and anodic reactions rate in Tafelplots. Also, EIS data showed charge transfer resistance was increase after coating the carbon steel with Fe3O4/PANI nanocomposite. Affecting parameters like mass ratio, amount of nanocomposite and incubation time, were optimized. Our electrochemical results showed that 100 mg/l of Fe3O4/PANI (1:1) nanocomposite in 60 mine can achieved to inhibition efficiency of 96% in 3.5% NaCl. Finally ability of proposed coting as an anticorrosive layer was further proofed by using surface methods i.e. SEM and EDXA. Observed results will be presented and discussed.

Keywords:

Corrosion , Polyaniline , Fe3O4 nanoparticles , Nanocomposite , 3.5% NaCl , EIS