Corrosion of mild steel in 5 % HCl system is an example of dissolution process in an acidic environment. The ongoing research is to develop the novel eco-friendly corrosion inhibitor in order to protect the mild steel metal from the corrosion phenomena. Herein, expired Varenicline drug is selected to study its adsorption property on the mild steel in 5 % HCl solution. The adsorption property of expired Varenicline drug was screened through weight loss, colorimetry, and atomic absorption spectroscopy techniques. All results revealed that, expired Varenicline drug form thick film over the surface of mild steel through physical or chemical interactions. These findings give deeper insights into an exploration of interaction of expired Varenicline drug with the surface of mild steel and helpful to development of novel non-toxic corrosion inhibitor to solve the mild steel dissolution problem.

The present study focussed on the performance of a sapota leaf extract in controlling the aluminium (Al) corrosion in 3 M sodium hydroxide (NaOH) medium thoroughly investigated through gasometric, atomic absorption spectroscopy, electrochemical Tafel diagrams and impedance spectroscopy techniques. The outcome shows that small amounts of the sapota leaf extract are sufficient for the effective mitigation of the Al corrosion process in 3 M NaOH solution. The gasometric data revealed that four different concentrations of the plant extract inhibit the Al corrosion process and the protection efficiency of the inhibitor varies with time of the system. Type of inhibition was studied by an electrochemical potentiodynamic polarization technique. The alternating current impedance spectroscopy results show that the plant extract inhibits the corrosion process by forming a defensive layer on the Al surface through an adsorption process, which confirms the inhibition properties of the plant extract. The presence of electron rich groups in the sapota leaf extract was confirmed by the Fourier transform infrared and energy-dispersive X-ray spectroscopy techniques. The particle size of the sapota leaf extract can be analysed by an X-ray diffraction technique. Further, atomic force microscopy and contact angle results evidence the adsorption of the sapota leaf extract on the Al surface. The morphology of the Al surface in protected and unprotected systems was examined through scanning electron microscopy techniques.

Objective: Aluminum (Al) corrosion in the NaCl solution is an example of dissolution in the neutral medium. The ongoing corrosion research efforts to produce the eco-friendly corrosion inhibitors to protect the aluminum metal from the corrosive solution. Methods: Herein, mass loss and atomic absorption spectroscopy (AAS) techniques were conducted to explain the adsorption property of expired Fluoxymesterone drug on the Al surface in the 3 % NaCl solution. Results: All results show that the expired Fluoxymesterone drug molecules generate a stable invisible layer through adsorption mechanism on the electrode surface. The corrosion inhibition behavior mainly depends on the concentration of the expired Fluoxymesterone drug and contact time at 313 K. Conclusion: The corrosion inhibition property is due to adsorption of electron-rich molecules on the Al surface in 3 % NaCl solution.

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