Corrosion is a pervasive issue and degradation phenomenon with huge consequences effects on human life and national economic development and also severe security implications. Thus, issues such as accurate assessment, prevention and prediction with green type of anti-corrosion materials based on the nanotechnology with high activity are fundamental to maintaining the integrity of many critical components and installations. The anti-corrosive of the present work is based on a novel phosphate-free nanocomposite containing polymer/zeolite nanocomposite. Polymer nanocomposites of polyaniline (PANI)-based NaY zeolite was synthesized by in situ chemical oxidative microemulsion polymerization by rapid mixing in a hydrochloric acid medium as anticorrosion nanocomposite coating to study its performance. DLS analysis was used to characterize particle size of the prepared nanocomposite. The obtained results and also AFM images show that the used nanocomposite can more effectively prevent corrosion up to 90% without any use of amine and oxygen scavenger. The improvement in the corrosion resistance of C1018 alloy due to the application of polymer/zeolite coating can be attributed to the uniformity and the inert nature of this coating.