Adhutodavasica nees leaf extract as corrosion inhibitorfor mild steel in acid medium
DOI:
https://doi.org/10.62638/ZasMat1219Abstract
Sustainable corrosion control methods have emerged due to stringent environmental laws and growing ecological awareness. This study explores the inhibition efficiency of Adhatoda vasica Nees ethanolic leaf extract on mild steel corrosion in HCl. Using data from mass-loss methods, potentiodynamic polarization, AC impedance, UV-visible spectra, FTIR, and SEM analyses, the corrosion inhibition mechanism was evaluated. The extract achieved a maximum inhibition efficiency of 79.72% at 95 ppm, with no significant improvement beyond this concentration. The adsorption activation energy was 36.6275 kJ/mol. A shift in corrosion potential (Ecorr) to less negative values and a decrease in cathodic slope indicated predominant control of the cathodic reaction, acting as a cathodic inhibitor. The double layer capacitance (Cdl) also decreased, suggesting efficient inhibition. UV-visible spectra indicated the formation of a protective film, while FTIR and SEM reports confirmed the adsorption of active compounds on the metal surface. The extract shows potential as an effective, eco-friendly corrosion inhibitor for mild steel in HCl.
Keywords:
Adhutoda vasica Nees, potentiodynamic polarisation, AC impedance spectrum, FTIR spectroscopy, SEMReferences
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