EFFICIENT CORROSION RESISTANCE OF MILD STEEL IN HYDROCHLORIC ACID BY A CARBOTHIOAMIDE-BASED PYRAZOLINE: ELECTROCHEMICAL, ADSORPTION AND DFT STUDIES
A newly synthesized carbothioamide-based pyrazoline was examined for its inhibition action against corrosionof mild steel in 0.5 M hydrochloric acid. Electrochemical techniques were employed to evaluate its performance. Results from electrochemical impedance spectroscopy (EIS) showed an inhibition efficiency of 81.27%. Potentiodynamic polarisation (PDP) studies yielded a similar result, with an efficiency of 82.28%at a 50ppmconcentration, confirming the good inhibitory action of CBP. The adsorption of CBP on the mild steel surfacecomplied with the Langmuir adsorption isotherm. Quantum chemical calculations were carried out using Gaussiansoftware. The UV-spectroscopic analysis confirmed the existence of a protective CBP film on the metal. Thefindings demonstrate that carbothioamide-based pyrazoline is a promising low-concentration corrosion inhibitor. This study supports the development of efficient corrosion mitigation strategies for industrial applications. Thepresent work contributes to Sustainable Development Goal (SDG-9): Industry, Innovation and Infrastructure.
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