Evaluation of Corrosion Inhibition and Adsorption Effect of Aqueous Chrysophyllum Albidum Leaves and Peels Extract on Mild Steel in Acidic Medium

Service failure of mild steel has been a challenge in many industries such as automotive, petrochemical and marine, thus, limiting the application of mild steel. This has prompted the use of several inhibitors as surface protectors against corrosion. In this work, the inhibiting action of the extract from leaves and peels of Chrysophyllum albidum on mild steel corrosion in 1 M H₂SO₄ solution was studied using weight loss, gasometric and polarization techniques. The results showed that the inhibiting action increased with the increasing concentration of the inhibitors. The highest efficiency of 94.39 and 99.96% were respectively obtained for leaves and peels extract for 18 days with a concentration of 1.5 g/L. More so, the leaves and peels extract inhibited mild steel exhibited a significant corrosion rate of 0.0616 and 0.0254 mm/year, respectively. There was a good agreement between weight loss, gasometric and electrochemical methods (potentiodynamic polarization). Chrysophyllum albidum adsorbed on the mild steel surface in accordance with a Langmuir isotherm adsorption model with R² values of 0.9940 and 0.9937 for the leaves and peels extract, respectively. In this study, Chrysophyllum albidum extract was shown to reduce corrosion of low carbon steel, and its use in acidic media is thus recommended.