Inhibition effect of 1-ethyl-3-methylimidazolium dicyanamide against steel corrosion

► Inhibition efficiency of 1-ethyl-3-methylimidazolium dicyanamide. ► Highly stable inhibitor film is assembled on steel. ► Excellent efficiency for 120 h exposure in acidic media. ► This compound could be successfully fixed within polypyrrole coating. ► The protection efficiency of polymer film is improved.