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N80 carbon steel (N80CS) is recognized for its superior mechanical properties and cost-effectiveness. However, its susceptibility to corrosion, particularly in hydrochloric acid (HCl) environments, necessitates the exploration of corrosion inhibitors. This research centers on the evaluation of N′-[(Z)-(4-bromophenyl)methylidene]pyridine-4-carbohydrazide (BBI) and N′-[(1Z)− 1-(4-chlorophenyl)ethylidene]pyridine-4-carbohydrazide (CEI), green organic compounds from the isonicotinohydrazide family, as potential eco-friendly and non-toxic inhibitors for N80CS in a 15 wt% HCl solution. An array of investigative methods, including weight loss measurements, electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization (PDP), were employed to examine the corrosion inhibition performance of these compounds for the N80CS surface in a strong HCl medium. Our experimental findings …