Investigation of the Corrosion Inhibition Properties of 4-Cyclohexyl-3-Thiosemicarbazide on Mild Steel in 1 M HCl Solution

The study investigated the effectiveness of 4-cyclohexyl-3-thiosemicarbazide (4C3T) as a corrosion inhibitor for mild steel in 1 M HCl solution using the weight loss method. Various concentrations of 4C3T, temperatures, and immersion times were used to determine the inhibitory efficiency. The results showed that increasing the concentration of 4C3T resulted in higher inhibition efficiency while increasing the temperature decreased it. The optimal conditions were found to be a concentration of 0.5 mM at 303 K, which resulted in a 95 % inhibition efficiency. The mechanism of inhibition involved the adsorption of 4C3T onto the mild steel surface, which prevented corrosion. The adsorption followed the Langmuir adsorption isotherm, where physical and chemical adsorption coexisted. Quantum chemical calculations were used to support the findings. Overall, the study highlights the potential of 4C3T as a corrosion inhibitor for mild steel in HCl solution and offers insights into the underlying inhibitory process.