The inhibition of mild steel corrosion in hydrochloric acid solution by ciprofloxacin drug as an eco-friendly and commercially available inhibitor was studied at room temperature by weight loss technique. It was found that the test drug has a promising inhibitory action against corrosion of mild steel in the medium investigated. The inhibition efficiency was found to increase with a corresponding increase in the concentration of the inhibitor. It was also found that the adsorption as well as the inhibition process followed a first-order kinetics and obeyed Langmuir’s adsorption isotherm.

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The inhibition effect of an environmentally friendly and cost-effective drug, amodiaquine, on the corrosion of mild steel in an acidic medium was studied by the weight loss method at room temperature. The study revealed that the test drug has an inhibitory action on the corrosion of mild steel in the investigated medium. The inhibition efficiency was found to increase with increasing inhibitor concentration. Plots of the concentration of metal versus time indicate first-order kinetics for the inhibition process. It was also found that amodiaquine adsorbs according to a Langmuir's adsorption isotherm. Attempts were made to correlate the chemical structure and the inhibition mechanism.