Study of Inhibition and Adsorption Properties of Mild Steel Corrosion by Expired Pharmaceutical Gentamicin Drug in Hydrochloric acid media

Abstract

This experiment avoids pollution and recycles of the drugs and also promotes economically benefited inhibitor. In this experiment expired Gentamicin drug was under studied for testing its inhibitive effect on mild steel in 1 M HCl acid medium with the weight loss and electrochemical techniques. The Various parameters were calculated such as corrosion rate, inhibition efficiency and surface coverage. The weight loss method shows that the inhibition efficiency increases when inhibitor concentration, immersion period and temperature increases.Obtained results in electrochemical Impedance and weight loss studies are very much excellent agreement with each other. Thermodynamic parameter like free energy value was negative, that shows spontaneous adsorption of inhibitor on the surface of the mild steel. The adsorption nature of the inhibitor on the surface of mild steel was under conformity with Langmuir adsorption isotherm. The mild steel surface morphology, with and without inhibitor was studied by using scanning electron microscopy

Ciprofloxacin Release and Corrosion Behaviour of a Hybrid PEO/PCL Coating on Mg3Zn0.4Ca Alloy

“…The result indicates that CIP enhances the protective capacity of HHC by 74%. To date, the effect of CIP was only investigated on corrosion of bare mild steel and bronze, where it exhibited an 86% and 57% inhibiting effect, respectively, in HCl [ 8 , 27 ].…”

Kinetics Consideration of Ethanol Leaves Extract of Costus Lucanusianus as Green Corrosion Inhibitor for Mild Steel and Aluminium in HCL Solution

“…The data in Table 4 obtained from the transition state plot of log CR/T versus 10 3 /T (Figure 5) for mild steel and aluminium in 1 M HCl in the absence and presence of different concentration of ELECL show positive values of ΔH indicating an endothermic reaction. Thus, implying that the inhibitors have the potential of influencing the incoming energy in the system resulting in higher potential energy and lower kinetic energy, hence breaking up the intermolecular force between the molecules, leading to a slower corrosion reaction rate Srinivasulu and Kasthuri (2017), Gadow and Motawea (2017). The negative values of ΔS indicate a decrease in the disorderliness of the system compared with the blank Azzaoui et al (2017) and therefore an increased orderliness in the system as a result of an orderly adsorption of the inhibitor molecules freely moving in the bulk solution onto the mild steel and aluminium metal surfaces which often indicates an associative mechanism in which both the molecules of the extracts and ions of the metals form a single activated complex, hence creating a better inhibition Cookey et al (2018) Figure 5 Transition state plot for mild steel and aluminium in different concentrations of ELECL…”

A Review on Expired Drug-Based Corrosion Inhibitors: Chemical Composition, Structural Effects, Inhibition Mechanism, Current Challenges, and Future Prospects

“…However, the performance may be still affected by other functional groups such as carbamate, furan, amide, and sulfide. Then, the expired Declophen (5), Concor (19), Metoclopramide (36), Alprazolam (40), and Metformin (45), contain the amine group, but the inhibition efficiency is < 90%. This indicates that since there are specific functional groups or elements with the unshared electrons in an expired drug compound, then it still has the potency to protect the metal from corrosion deterioration.…”

“…The presence of dissolved oxygen in the corrosive solutions and the oxygen element in inhibitor molecules even will increase oxygen content on the metal surface [30]. Meanwhile, the presence of chloride in the expired Voltaren (8), Amlodipine besylate (11), Declophen (5), Metoclopramide (36), Oxazepam (38), Indomethacin (43), and Lupicof (6, 7) may generate a confusing conclusion due to overlapping chloride peak in the EDX spectra.…”