ISSN(Online): 2319-8753 ISSN (Print): 2347-6710 International Journal of Innovative Research in Science, Engineering and Technology (A High Impact Factor, Monthly, Peer Reviewed Journal) Visit: www.ijirset.com Vol. 6, Issue 11, November 2017 Copyright to IJIRSET DOI:10.15680/IJIRSET.2017.0611096 22081 The Study of Aloe-Vera gel Extract as Green Corrosion Inhibitor for Mild Steel in Acetic acid. R. T. Vashi 1 , H. G. Chaudhari 2 * Associate Professor, Department of Chemistry, Navyug Science College, Rander Road, Surat, Gujarat, India 1 Asistant Professor, Department of Chemistry, The Mandvi Education Society, Diwaliba Science College, Mandvi, Gujarat, India 2 . ABSTRACT: Aloe vera (Aloe Vera) gel extract was investigated as green corrosion inhibitor of mild steel in acetic acid solution using weight-loss and electrochemical techniques like potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The experimental result shows that the Aloe vera gel extract is good corrosion inhibitor and inhibition efficiency increase with the extract concentration. Aloe vera extract shows maximum I.E. of 82.35 % at an optimum concentration of 1.0 g/L. The value of activation energy shows that the Aloe vera gel extract is better inhibitor at lower temperature. The negative value of Q ads supports spontaneous adsorption of the inhibitor. The adsorption characteristic of the Aloe vera gel extract on mild steel surface obeys Langmuir adsorption isotherm. The potentiodynamic polarization study shows that it is a mixed type inhibitor. The result obtained from weight-loss and electrochemical techniques are reasonably in agreement KEYWORDS: Mild steel, Acetic acid, Corrosion, inhibition, Aloe vera, Weight loss, Polarization, EIS. I. INTRODUCTION Corrosion of metal/alloy defined as the deterioration of materials due to their reaction with the environment. It is a common problem in industry and it has received a considerable amount of attention. Mild steel is widely used as constitutional material in many industries due to its good mechanical property and low cost. However, the main problem ofusing mild steel is its dissolution in acidic medium. Acid solutions are widely used for removal of undesirable scale and rust in many industrial process. The use of inhibitor is one of the most important methods for protection of mild steel against corrosion in acid media. Large numbers of organic compounds [1-4] have been studied to investigate their corrosion inhibition effect. All these studies reveals that organic compounds especially those contains N, S and O showed inhibition efficiency. But a major disadvantage of these inhibitors is their toxicity. Thus attention have been shifted towards investigating the eco-friendly inhibitors. Numerous naturally occurring plants organ extract, like Psidium guajava (guava) leaf extract[5], Aspilia africana leaves extract [6], Rubber leaf Extract [7], Piper nigrum [8], Dodonaea viscose (L.) leaves extract[9] and fig leaves extract [10] have been evaluated as effective corrosion inhibitors.The main aim of present work is to find out corrosion inhibition efficiency (IE) of aqueous extract of Aloevera gel as green inhibitor for mild steel in acetic acid solution. II. EXPERIMENTAL 2.1. Preparation of sample and solution Mild steel specimens with a chemical composition of C = 0.25%, Mn = 0.50%, Si = 0.35%, P = 0.09%, S = 0.07% and Fe = 98.74%are used in the present study. The metal sheet, test specimens of size 4.52.00.2cm having an effective area of 0.2097 dm 2 are used. The specimens are cleaned by washing with distilled water, degreased by acetone, washed