Mitigation of Acid Corrosion on Carbon Steel by Naturally Occurring Gum Exudate

Malarvizhi Manickam1,*, Dheenadhayalan Sivakumar2 and Mallika Jaganathan2

1Department of Chemistry, Sri GVG Visalakshi College for Women, Udumalpet-642 128, India

2Department of Chemistry, P.S.G. College of Arts and Science, Coimbatore-641 014, India

*Corresponding author: E-mail: malar_gvg@rediffmail.com

Abstract

Gum exudates of Azadirachta indica (GAI) was tested as corrosion inhibitor for carbon steel in 1 N H2SO4 by means of different techniques viz., gravimetric experiments, electrochemical polarization and impedance studies, IR and SEM techniques. Nature of adsorption is reported and it follows Langmuir isotherm. Polarization method indicated mixed mode behaviour of the inhibitor. AC impedance studies supported mitigation effects of gum exudates of Azadirachta indica. IR and SEM studies reveal the protection of carbon steel through adsorption.

Keywords

Azadirachta indica gum, Corrosion inhibitor, Electrochemical studies, Chemisorption, SEM.

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