Synthesis, characterization, and corrosion inhibition study of polyaniline-α-Fe_2O_3 nanocomposite

摘要

Polyaniline (PANI)-α-Fe_2O_3 nanocomposites (NCs) have been synthesized by chemical oxidative in situ polymerization of aniline in presence of α-Fe_2O_3 nanoparticles at 5°C using (NH_4)_2S_2O_8 as an oxidant in an aqueous solution of sodium dodecylbenzene sulphonic acid (SDBS), as surfactant and dopant under N_2 atmosphere. The room temperature conductivity of NCs decreases and coercive force (H_c) increases with an increase addition of α-Fe_2O_3 in PANI matrix. The result of FTIR and TGA shows that the interaction between α-Fe_2O_3 particles and PANI matrix could improve the thermal stability of NCs. NCs demonstrate the superparamagnetic behavior. The performance of PANI and PANI-α-Fe_2O_3 NCs as protective coating, against corrosion of 316LN stainless steel in 3.5% NaCl was assessed by potentiodynamic polarization technique. The study shows a good corrosion inhibition effect of both the coatings.