Inhibition of Mild Steel Corrosion in Sulphuric Acid Using Esomeprazole and the Effect of Iodide Ion Addition

Abstract

The inhibition of the corrosion of mild steel in 1 M H 2 SO 4 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.

Investigations of the inhibition of copper corrosion in nitric acid solutions by levetiracetam drug

“…1(a) and (b). From the weight loss measurements, the corrosion rate (W) was calculated by using the following relation [18];…”

Corrosion Inhibitors

“…The most common inhibitors of this category are the silicates and the phosphates. For example, Sodium silicate, is used in many domestic water softeners to prevent the occurrence of rust [57,58].…”

Effect of Anion Groups on Corrosion Inhibition Behaviours of Vietnam Orange Peel Essential Oil for Mild Steel in the Acidic Media

“…In some cases the adsorption occurs through already adsorbed chloride ions in case of HCl or sulfate ions in case of H 2 SO 4 that interfere with the adsorbed organic molecules. The lesser interference of SO 4 2-ions with the adsorbed protonated cations may lead to lower adsorption and inhibition of corrosion [14,15]; (iii) Moreover, it is thought that the halide ions are able to improve adsorption of the organic cations by forming the intermediate bridges between the positively charged metal surface and the positive end of the inhibitor [16]. Therefore, the adsorption of OPE on steel surface in 1N HCl solution is stronger than that in 1 N H 2 SO 4 solution, which leads to higher inhibition performance in HCl than that in H 2 SO 4 .…”