STUDIES ON THE INHIBITIVE EFFECT OFDATURA STRAMONIUMEXTRACT ON THE ACID CORROSION OF MILD STEEL

Pandian Bothi Raja and Mathur Gopalakrishnan Sethuraman ()
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Pandian Bothi Raja: Department of Chemistry, Gandhigram Rural University, Gandhigram 624 302, Tamil Nadu, India
Mathur Gopalakrishnan Sethuraman: Department of Chemistry, Gandhigram Rural University, Gandhigram 624 302, Tamil Nadu, India

Surface Review and Letters (SRL), 2007, vol. 14, issue 06, 1157-1164

Abstract: The extract ofDatura stramoniumhas been studied as a possible source of green inhibitor for corrosion of mild steel (MS) inHClandH2SO4media at different temperatures. The anticorrosion effect was evaluated by conventional weight loss studies, electrochemical studies viz., Tafel polarization, ac impedance, and SEM studies. The studies reveal that the plant extract acts as a good inhibitor in both the acid media and better inH2SO4medium. Tafel polarization method indicate that the plant extract behaves as a mixed mode inhibitor. Double layer capacitance and charge transfer resistance values derived from Nyquist plots obtained from ac impedance studies give supporting evidence for the anticorrosive effect. The inhibitive effect may be attributed to the adsorption of the inhibitor on the surface of MS, following Temkin adsorption isotherm. Increase of inhibition efficiency with increase of temperature along with Ea values serve as a proof for chemisorption. SEM studies provide the confirmatory evidence for the protection of MS by the green inhibitor. The study reveals the potential ofD. stramoniumfor combating corrosion which may be due to the adsorption of alkaloids and other phytoconstituents.

Keywords: Datura stramonium; corrosion inhibitor; electrochemical studies; chemisorption (search for similar items in EconPapers)
Date: 2007
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DOI: 10.1142/S0218625X07010743

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