The corrosion and behavior of carbon steel in 2M HCl in the presence of N-(2-hydroxybenzilidene) thiosemicarbazide (HBTC) was investigated using weight loss and electrochemical studies. The morphology of carbon steel surface was investigated using scanning electron microscopy (SEM) and Mossbauer spectrometry. The corrosion current was determined using Tafel polarization. The inhibition efficiency increased with HBTC concentration; the experimental results suggest that the presence of HBTC in the solution increases the surface coverage (); a decrease in the corrosion spot with the increase of the HBTC concentration indicates good adsorbability of HBTC on the metal surface. The adsorption of this compound on the metal surface is found to obey Langmuir's adsorption isotherm. Mossbauer spectroscopy showed at this stage the main product of corrosion is a non-stoichiometric amorphous Fe3+ oxyhydroxide, consisting of a mixture of , , and -FeOOH, where -FeOOH is the main phase.