Inhibitive action of <Emphasis Type="Italic">Clematis gouriana</Emphasis> extract on the corrosion of mild steel in acidic medium |
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| Authors: | Gopiraman Mayakrishnan Sakunthala Pitchai Kanmani Raman Alex Ramani Vincent Sulochana Nagarajan |
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| Institution: | (1) Department of Chemistry, National Institute of Technology, Trichy, 620015, India;(2) Department of Chemistry, St. Joseph’s College, Trichy, 620002, India;(3) Nano Fusion Technology Research Lab, Faculty of Textile Science and Technology, Shinshu University, Ueda City Nagano, 386–8567, Japan; |
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| Abstract: | The inhibitive action of Clematis gouriana (CG) on mild steel (MS) corrosion in 1.0 M HCl solution was studied. Inhibition efficiency of CG was carried out by using
various weight loss methods, potentiodynamic polarisation, and electrochemical impedance spectroscopy. Inhibition efficiencies
of up to 95.70% for CG can be obtained. Adsorption of CG on the MS surface was found to obey the Langmuir adsorption isotherm.
Free energy of adsorption calculated from the temperature studies revealed the possibility of both chemisorptions and physisorption.
The adsorbed film on the MS surface containing the CG inhibitor was also characterized by Fourier transform infrared spectroscopy
(FTIR) and scanning electron microscope and energy-dispersive spectrum. The possible active ingredient responsible for the
anticorrosion effect is identified as aporphine alkaloid which is isolated and screened for the anticorrosion effect using
electrochemical studies. The possible mode of corrosion inhibition of aporphine alkaloid is also derived using FTIR studies. |
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