Inhibition of Aluminium Corrosion Using Carica papaya Leaves Extract in Sulphuric Acid

Abstract

Inhibition of aluminium corrosion using C. papaya leaves extract in 1.0 M H2SO4 was investigated by using gravimetric analysis at various concentrations and temperatures: 303 K, 313 K and 323 K. Characterization was done by using Scanning Electron Microscope (SEM) and Fourier Transform Infrared (FT-IR) spectroscopy. Results show that, inhibiting ability of the extract was due to its adsorption onto the metal surface through Langmuir adsorption isotherm. Thermodynamic (Gibbs energy, entropy and heats of adsorption) and kinetic parameters (activation energy and entropy of activation) were also determined. All of these agreed to physical adsorption of inhibitor onto the aluminium surface.