Inhibition by Jasminum nudiflorum Lindl. leaves extract of the corrosion of aluminium in HCl solution

The inhibition effect of Jasminum nudiflorum Lindl. leaves extract (JNLLE) on the corrosion of aluminium in HCl solution was studied by weight loss, polarization curves, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM) methods. The results show that JNLLE is a good inhibitor in 1.0 M HCl, and the adsorption of JNLLE obeys Langmuir adsorption isotherm. Effects of immersion time and acid concentration on inhibitive performance were discussed. Polarization curves reveal that JNLLE acts as the cathodic inhibitor. EIS exhibits a large capacitive loop at high frequencies followed by a large inductive one at low frequency values.

► JNLLE is a new inhibitor for aluminium corrosion in 1.0 M HCl.
► The adsorption of JNLLE obeys Langmuir adsorption isotherm.
► The adsorption of JNLLE is mainly the physical adsorption.
► Effects of immersion time and acid concentration on inhibition are discussed.
► JNLLE behaves as a cathodic inhibitor, EIS exhibits an elliptic shape.