Mechanistic insights into the corrosion inhibition of mild steel by eco-benign Asphodelus Tenuifolius aerial extract in acidic environment: Electrochemical and computational analysis

Abstract

This study explores the novel application of Asphodelus Tenuifolius aerial extract (ATAE) as a corrosion inhibitor for mild steel in a 0.5 M HCl acidic environment. By utilizing techniques such as electrochemical measurements, gravimetric analysis, SEM, and CA assessments, the inhibitory potential of ATAE has been comprehensively evaluated. The results revealed a concentration -dependent enhancement in corrosion resistance, classifying ATAE as a mixed -type inhibitor by measuring the anodic ( beta a ) and cathodic ( beta c ) polarization slope values of 108.89 and -129.33 mV/dec. The peak inhibition efficiency was observed at 250 ppm, reaching an impressive IE % of 94.40 % at 298 K (Kelvin). The electrochemical analysis demonstrated a significant increase in charge transfer resistance (R ct ) and polarization resistance (R p ) values, coupled with a decrease in Constant Phase Element (CPE.Y o ) value to 162.94 mu F, indicating heightened corrosion inhibition potential. Additionally, Theoretical calculations emphasized a strong interaction between ATAE and mild steel surface, characterized by a low energy gap ( Delta E), indicating excellent anti -corrosion abilities at the micro -level. This study positions ATAE as a promising corrosion inhibitor, offering insights for further research in corrosion prevention strategies using a sustainable corrosion inhibitor.