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Anticorrosion Activity of 8-Quinoline Sulphonyl Chloride on Mild Steel in 1M HCl Solution


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1 Department of Chemistry,The Gandhigram Rural Institute-Deemed University, Gandhigram, Tamil Nadu 624 302, India
 

An anticorrosion activity of 8-quinoline sulphonyl chloride (8-QSC) on mild steel in 1M HCl solution was studied by weight loss (WL) method and electrochemical methods, namely, electrochemical impedance spectroscopy (EIS), Tafel polarization (TP), and linear polarization resistance (LPR). Results obtained from WL method, EIS, TP, and LPR, showed that 8-QSC is a good corrosion inhibitor for mild steel in 1M HCl solution. The results indicated that the inhibition efficiency and extent of surface coverage were increased with increase in inhibitor concentration and decrease in the corrosion rate.This is due to the formation of protective film on the surface of mild steel. Adsorption of 8-QSC on the mild steel surface was found to obey the Langmuir adsorption isotherm. A Tafel plot indicates that the used inhibitor behaves predominantly as cathodic type.The surface morphology of the mild steel was studied by Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray (EDX) Spectroscopy techniques. All the methods give the same order of inhibition efficiencies.
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  • Anticorrosion Activity of 8-Quinoline Sulphonyl Chloride on Mild Steel in 1M HCl Solution

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Authors

R. Ganapathi Sundaram
Department of Chemistry,The Gandhigram Rural Institute-Deemed University, Gandhigram, Tamil Nadu 624 302, India
M. Sundaravadivelu
Department of Chemistry,The Gandhigram Rural Institute-Deemed University, Gandhigram, Tamil Nadu 624 302, India

Abstract


An anticorrosion activity of 8-quinoline sulphonyl chloride (8-QSC) on mild steel in 1M HCl solution was studied by weight loss (WL) method and electrochemical methods, namely, electrochemical impedance spectroscopy (EIS), Tafel polarization (TP), and linear polarization resistance (LPR). Results obtained from WL method, EIS, TP, and LPR, showed that 8-QSC is a good corrosion inhibitor for mild steel in 1M HCl solution. The results indicated that the inhibition efficiency and extent of surface coverage were increased with increase in inhibitor concentration and decrease in the corrosion rate.This is due to the formation of protective film on the surface of mild steel. Adsorption of 8-QSC on the mild steel surface was found to obey the Langmuir adsorption isotherm. A Tafel plot indicates that the used inhibitor behaves predominantly as cathodic type.The surface morphology of the mild steel was studied by Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray (EDX) Spectroscopy techniques. All the methods give the same order of inhibition efficiencies.