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Effective corrosion management is a pivotal challenge facing various industries and holds crucial importance in aligning industrial processes with sustainability goals. This study focused on the synthesis and evaluation of two indolin-2-one derivatives: (E)-1-allyl-3-(2-(5-oxo-4,4-diphenyl-4,5-dihydro-1H-imidazol-2-yl)hydrazono)indolin-2-one (AIHI) and (E)-3-(2-(5-oxo-4,4-diphenyl-4,5-dihydro-1H-imidazol-2-yl)hydrazono)-1-(prop‑2-yn-1-yl)indolin-2-one (PIHI), as sustainable corrosion inhibitors for N80 carbon steel (N80CS) in a 15 wt. % HCl medium. Chemical, electrochemical, and surface characterization techniques were utilized to evaluate the corrosion inhibition mechanism and the performance of the compounds under investigation. The weight loss method highlighted that tested compounds exhibited promising inhibition efficiencies: 91.54 % for AIHI and 81.97 % for PIHI, respectively, at 303 K, with an …