electrosynthesis, characterization and corrosion inhibition study of dbsa-doped polyaniline coating on 310 stainless steel

The synthesis of polyaniline doped with dodecylbenzene sulphonic acid (pani-dbsa) coatings on 310 stainless steel (310 ss) surfaces has been investigated by using the galvanostatic method. the synthesized coatings were characterized by fourier transform infrared spectroscopy (ft-ir), uv-visible absorption spectrometry and scanning electron microscopy (sem). the anticorrosion performances of pani-dbsa coatings were investigated in 5% nacl solution by the potentiodynamic polarization technique and electrochemical impedance spectroscopy (eis). the corrosion rate of pani-dbsa coated 310 ss was found ∼30 times lower than bare 310 ss and potential corrosion increased from -0.84 v versus ag/agcl for uncoated 310 ss to -0.71 v versus ag/agcl for pani-dbsa coated 310 ss electrodes. electrochemical measurements indicate that pani-dbsa coated have good inhibiting properties with a mean efficiency of ~96% at 5 ma cm-2 current density applied to 310 ss corrosion in chloride media. the results of this study clearly ascertain that the pani-dbsa has an outstanding potential to protect 310 ss against corrosion in a chloride environment.