Effect of talc as reservoir of benzothiazole on the mild steel corrosion in a sodium chloride solution

This paper evaluates the function of talc as a reservoir and its ability to absorb and release corrosion inhibitors. In this sense, the performance of released corrosion inhibitors is studied by using electrochemical analysis such as electrochemical impedance spectroscopy as well as surface analysis such as scanning electron microscopy and Energy-dispersive X-ray spectroscopy. Results indicated that talc can adsorb benzothiazole )BTH( as an organic inhibitor and release it in a sodium chloride solution. The trend and magnitude of some parameters including low frequency impedance modulus, polarization resistance and current density revealed the effective role of inhibitor-doped talc in controlling the corrosion of mild steel in sodium chloride solution. The scanning electron microscopy results showed that in the presence of benzothiazole, formation of a compact film on the substrate surface, increasing the corrosion resistance.