The Inhibitive Properties of Avocado (Persea Americana) Leaves Extract on the Corrosion of Mild Steel in 1M HCl

Abstract

The corrosion inhibition activity of avocado (Persea americana) leaves extract (AV), on mild steel in 1 M HCl was studied employing gravimetric analysis and electrochemical techniques, including Potentiodynamic Polarization (PDP) and Electrochemical Impedance Spectroscopy (EIS). The results show that AV significantly inhibited the corrosion of mild steel, with the highest inhibition efficiency recorded at 1500 mg/L, getting to 93.8%. Electrochemical impedance spectroscopy reflected an increase in charge transfer resistance (Rct) and a lowering in double layer capacitance (Cdl), meaning the adsorption of AV molecules on the steel surface. Potentiodynamic polarization curves implied that AV works as a mixed-type inhibitor, effectively bringing down both cathodic and anodic reactions. The findings show that Avocado leaf, AV, offers good potential as a green corrosion inhibitor for mild steel in acidic environments.