Journal :   Asian Journal of Research in Chemistry

Volume No. :   2

Issue No. :  4

Year :  2009

Pages :   427-431

ISSN Print :  0974-4169

ISSN Online :  0974-4150


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Inhibitive Effect by Acid Extracts of Malachra capitata Leaves on the Sulphuric Acid Corrosion of Mild Steel



Address:   NS Patel*, S Jauhari and GN Mehta
Applied Chemistry Department, S V National Institute of Technology, Surat-395007, Gujarat, India
*Corresponding Author
DOI No:

ABSTRACT:
Extract of Malachra capitata leaves was investigated as corrosion inhibitor of mild steel in 1 N H2SO4 using conventional weight loss, electrochemical polarizations, electrochemical impedance spectroscopy and scanning electron microscopic studies. The weight loss results showed that the extract of Malachra capitata leaves is an excellent corrosion inhibitor, electrochemical polarizations data revealed the mixed mode of inhibition and the results of electrochemical impedance spectroscopy have shown that the change in the impedance parameters, charge transfer resistance and double layer capacitance, with the change in concentration of the extract is due to the adsorption of active molecules leading to the formation of a protective layer on the surface of mild steel. Scanning electron microscopic studies provided the confirmatory evidence of improved surface condition, due to the adsorption, for the corrosion protection.
KEYWORDS:
Malachra Capitata; Acid corrosion inhibitor; electrochemical polarization; electrochemical impedance spectroscopy.
Cite:
NS Patel, S Jauhari, GN Mehta. Inhibitive Effect by Acid Extracts of Malachra capitata Leaves on the Sulphuric Acid Corrosion of Mild Steel. Asian J. Research Chem. 2(4):Oct.-Dec. 2009 page 427-431.
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