The Inhibitive Effect of Eucalyptus Camaldulenis Leaves Extract on the corrosion of low carbon steel in Hydrochloric Acid

Abstract

The inhibition behavior of eucalyptus camaldulenis leaves extract on the corrosion of low carbon steel in 3M HCl solution have been investigated using the gravimetric technique, Five different concentrations (2, 4, 6, 8and 10) g/l of eucalyptus camaldulenis leaves extract were studded .It was shown that the presence of eucalyptus camaldulenis leaves extract inhibited the corrosion of low carbon steel in the test solutions and that the inhibition efficiency depended on the concentration of the plant extract and on the time of exposure of the low carbon steel samples in 3M HCl solutions containing the extract. The experimental data complied form of the Langmuir adsorption isotherm and the value and sign of the Gibb’s free energy of adsorption obtained suggested that inhibitor molecules have been spontaneously adsorbed onto the low carbon steel surface through a physical adsorption mechanism.