Abstract
The inhibition of the corrosion of mild steel in 1 M H2SO4 solution by the pharmaceutically active compound esomeprazole (ESP) has been investigated by using weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy measurements. The effect of temperature on the corrosion behavior with the addition of different concentrations of ESP was studied in the temperature range of 30–60°C. Results obtained revealed that the inhibition efficiency increased with the increase in concentration of the inhibitor but decreased with the increase in temperature. The addition of KI increased the inhibition of ESP to a considerable extent. The experimental results suggest that the presence of iodide ions in the solution stabilized the adsorption of the ESP molecule on the mild steel surface, thereby improving the inhibition efficiency. Polarization curves indicated that the ESP belonged to a mixed-type inhibitor. Adsorption of the inhibitor on the mild steel surface is found to obey the Langmuir adsorption isotherm. Some thermodynamic functions of dissolution and adsorption processes were also determined. Surface analysis via scanning electron microscope (SEM) and atomic force microscope (AFM) shows a significant improvement in the surface morphology of the mild steel plate.
Highlights
The environmental consequence of corrosion is enormous, and its inhibition has been deeply investigated
It has been observed from the results that the IE% of ESP increases from 50.72% to 80.97% with the increase in inhibitor concentration from 50 to 300 ppm
The increase in efficiency from 50.72% to 80.97% may be due to the blocking effect of the surface by both adsorption and film formation mechanisms, which decreases the effective area of corrosion attack [5]
Summary
The environmental consequence of corrosion is enormous, and its inhibition has been deeply investigated. The main objective here is to find out the synergistic effect with halide ions and to investigate the temperature dependence of the corrosion rate with the aim to obtain the apparent activation energies of the corrosion process of steel in 1 M H2SO4 solution in the absence and presence of different concentrations of ESP. It was the purpose of the present work to test the experimental data with several. Adsorption isotherms at different temperatures, in order to determine the standard free energies of the adsorption process and gain more information on the mode of adsorption of the inhibitor on the electrode surface
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