**5. Conclusion**

Efficient inhibitors and organic coatings are able to extend the life of some metal surfaces. Chitosan is a component with a high potential for protection against corrosion of metals when exposed to corrosive media. In the first stage, the pure chitosan form is used to omit the corrosion of numerous metallic-based materials. Nevertheless, the lower water-solubility of this biopolymer was limited to its application and its utilization to a broad aggressive media range such as near-neutral solutions. Although, such weakness can overcome and the prevention performance of chitosan can be improved through different functionalization demarches. Furthermore, chitosan can be combined with the other materials to develop new chitosan-nanoparticles composites that can apply as coatings.
