Organic inhibitors have had a great boom in the field of research in the last decade, since they have been reported to be good inhibitors of corrosion by having in their chemical composition atoms of nitrogen, sulfur or oxygen, allowing to be absorbed on the surface of the metal, and for having environmentally friendly characteristics. Polymeric coatings have always been good protectors of corrosion in multiple metals in different solutions. Likewise, this project seeks to help the environment with the recycling of this waste polymer being used in multiple areas, mostly in the automotive industry, generating tons of waste in its manufacturing process. On the other hand, the remains of the expired medicines generate thousands of kilograms of garbage, which later become fuel for cement factories, contaminating the environment in a different way.

The aim of this study is to evaluate the corrosion protection of a polymer coating doped with an organic inhibitor extracted from an expired drug on mild steel in alkaline and basic solutions. Electrochemical tests were carried out, such as Electrochemical Impedance Spectroscopy, Electrochemical Noise and Polarization Resistance, and it was characterized by FTIR, XRD, and AFM to confirm the union of both elements.

Electrochemical tests shown, that the system coating/inhibitor had good results in the basic solution, maintaining a constant resistance in the time that the test lasted (2000 hours). Likewise, in the alkaline solution, the system coating/inhibitor indicate an offspring in the resistance, obtaining an inferior behavior that the blank. The FTIR and XRD characterization indicate that in the dissolution, there are no chemical reactions that affect the properties or characteristics of each component. In AFM shows that, although there are some pores in the area, the coating is uniform in the entire surface.