Corrosion Inhibition and Adsorption Behavior of Murraya koenigiiExtract for Corrosion Control of Aluminumin Hydrochloric Acid Medium

Pushpanjali, M and Rao, Suma and Padmalatha, * (2017) Corrosion Inhibition and Adsorption Behavior of Murraya koenigiiExtract for Corrosion Control of Aluminumin Hydrochloric Acid Medium. Surface Engineering and Applied Electrochemistry, 53 (5). pp. 475-485. ISSN 1068-3755

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Abstract

The corrosion behavior of aluminum in the hydrochloric acid medium of pH 3 was studied usingTafel polarization and electrochemical impedance spectroscopy techniques in the presence or the absence ofthe Murraya koenigii (commonly known as curry) leaves extract at 303 K to 323 K. The concentration of theinhibitor used was in a range of 0.05–0.4 gL−1. The inhibition efficiency was found to increase with increasingthe inhibitor concentration and decreasing temperature. Polarization data showed that the curry leavesextract (CLE) acted as anodic type of inhibitor at lower concentrations of the inhibitor and as mixed type athigher concentrations of the inhibitor. The maximal inhibition efficiency of 91.79% was obtained with the CLE at its optimum concentration of 0.4 gL−1. Adsorption of the CLE was found to obey the Langmuiradsorption isotherm and underwent both physisorption and chemisorption process. The kinetic and thermodynamicparameters were calculated and discussed in detail. The results obtained by both methods were ingood agreement with each other. The protective film formed on the surface of aluminum by the adsorption of inhibitor molecules present in the CLE in the hydrochloric acid medium of pH 3 was confirmed by the scanning electron microscopy and energy-dispersive X-ray spectroscopy. So, the CLE emerged as a potential, cost-effective and eco-friendly natural inhibitor for the corrosion control of aluminum in the hydrochloric acid medium.

Item Type: Article
Uncontrolled Keywords: aluminum, green inhibitor, curry leaves, Tafel polarization, electrochemical impedance spectroscopy,scanning electron microscopy
Subjects: Engineering > MIT Manipal > Chemistry
Depositing User: MIT Library
Date Deposited: 18 Nov 2017 08:25
Last Modified: 18 Nov 2017 08:25
URI: http://eprints.manipal.edu/id/eprint/149985

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