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KMID : 1059520110550030495
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Journal of the Korean Chemical Society
2011 Volume.55 No. 3 p.495 ~ p.501
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Corrosion Inhibitive and Adsorption Properties of a Flavonoid compound for Mild Steel in Acidic Medium
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Ezhilarasi, J. Christy
Nagarajan, Prabavathy
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Abstract
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The corrosion inhibitive nature of a flavonoid compound, 3-Hydroxy-7-methoxy-2-phenylchromen-4-one (HMPC), the synergistic effect between HMPC and n-Tetrabutylammonium bromide (TBAB) and their adsorption behavior on mild steel in hydrochloric acid solution were studied by weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements. The results of weight loss study at different temperatures revealed that the inhibition efficiency increases with inhibitor concentration and decreases with increase in the temperature of the system. The electrochemical studies showed that the inhibitor acts through mixed mode of inhibition and the inhibitor molecules adsorb on the metal - solution interface forming a protective layer. The adsorption of the inhibitor molecules over the metal surface was supported by the obeyed Langmuir’s adsorption isotherm, Scanning Electron Microscopic analysis (SEM) and Fourier Transform Infrared (FT-IR) spectroscopic studies.
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KEYWORD
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3-Hydroxy-7-methoxy-2-phenylchromen-4-one, n-Tetrabutylammonium bromide, Synergistic effect, Adsorption isotherm, Potentiodynamic polarization, Electrochemical impedance spectroscopy (EIS)
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