2-((5-Mercapto-1,3,4-thiadiazol-2-ylimino)methyl-6-methoxy) phenol Schiff base as a New and Effective Corrosion Inhibitor for Mild Steel in Hydrochloric Acid Solution

Corrosion inhibition of 2-((5-Mercapto-1,3,4-thiadiazol-2-ylimino) methyl- 6-methoxy) phenol Schiff base (MTMMP) as a new and effective corrosion inhibitor for mild steel in 1M HCl was investigated by means of weight loss (WL), potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS). The results show that the MTMMP Schiff base has excellent inhibition efficiency for mild steel in 1M HCl. The inhibition efficiency increases with the increase inhibitor concentration, and decreases with increasing temperature in the studied temperature range. The studied inhibitor acts as a mixed type corrosion inhibitor. The adsorption of MTMMP Schiff base on the mild steel surface conforms to Langmuir adsorption isotherm. The quantum chemical calculations were carried out to explain a relationship between the adsorption behavior and the structure of MTMMP molecule.