The interfacial behavior of fluconazole on mild steel in 1？M HCl solution was studied by electrochemical methods, namely, polarization (Tafel Plot) and Electrochemical Impedance Spectroscopy (EIS). The surface morphology of mild steel in the presence and absence of fluconazole was studied by Atomic Force Microscopy (AFM). The results of the study showed that fluconazole reduced the corrosion rate in HCl acid solution by adsorbing on the surface of mild steel. Tafel results suggest that fluconazole behaves predominantly as an anodic inhibitor and shows greater inhibition efficiency (96%) at 0.30？mM. Thermodynamical parameters suggest that fluconazole is adsorbed on mild steel mainly by chemical mode. The EIS studies reveal the formation of a thin barrier film on mild steel surface. The AFM image of mild steel immersed in optimum concentration of fluconazole has confirmed the film formation on metal surface. 1. Introduction Acid solutions are widely used in ore processing, fertilizer manufacturing, oil refining, waste water processing, chemical synthesis, and pickling and descaling processes [1–4]. Active metals such as mild steel, Zn, and Al are employed in industries for fabrication purposes due to their easy availability and low cost, where surfaces are rapidly damaged in the presence of acids [5]. Among the various methods to control the destruction of these active metals in acid solutions, the use of inhibitors is quite popular [6–8]. Organic compounds containing heteroatoms like P, S, N, and O have been explored as good corrosion inhibitors [9–11]. They adsorb on the metal surface in the acid solutions either physically or chemically thereby blocking the corrosion reaction. However, most of these inhibitors suffer from nonbiodegradability and some of them are also toxic to living beings. In modern scenario, development of novel biodegradable and less toxic corrosion inhibitors is gaining importance. Biologically active molecules like sulfadimidine, sulfamethoxazole, cefatrexyl, apart from other antibacterial, and antifungal drugs have been reported as good corrosion inhibitors [12–18]. In the present study, adsorption behavior of an antifungal drug, fluconazole (2-(2,4-difluorophenyl)-1,3-di(1H-1,2,4-triazol-1-yl)propan-2-ol), was evaluated for changes that occur in mild steel/HCl acid interface in view of the fact that fluconazole contains two triazole rings with active centers like N and aromatic π electrons, which can aid adsorption on mild steel surface minimizing the corrosion process in HCl medium. Perusal of the literature shows that the
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