Investigation of Metoclopramide tablet՚ prohibiting effect on mild steel corrosion in 0.5 M phosphoric acid environment

In this study, we investigated the effect of Metoclopramide as corrosion inhibitor for mild steel (MS) in 0.5 M phosphoric acid solution by electrochemical measurements such as tafel polarization and electrochemical impedance spectroscopy. The inhibition efficiency was found to grow with increasing inhibitor concentration. Metoclopramide showed 97% inhibition efficiency at concentration of 300 ppm. Adsorption of the inhibitor follows Langmuir adsorption isotherm. The effect of temperature on corrosion rate in absence and presence of these drug was studied too. Some thermodynamic parameters were computed from the effect of temperature on corrosion and inhibition processes. Surface characterization techniques (FTIR and SEM) are used to ascertain the nature of the protective film, as well.