Conclusions Polyaniline and polyaniline/clay nanocomposites were pre-pared via in situ oxidative polymerization and the resulted powders were incorporated into the epoxy matrix. It was concluded that epoxy coating modified by PANI/clay nanocomposite particles exhibited improved anticorrosion performance in comparison with neat epoxy and epoxy/PANI samples. Furthermore, the corrosion protection efficiency of steel panel coated with epoxy/PANI/OMMTappeared to be much higher than that of epoxy/PANI/MMTone.