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Metallurgical and Materials Transactions A
Erschienen in: Metallurgical and Materials Transactions A 4/2012

01.04.2012

Elucidation of the Corrosion Inhibition of Mild Steel in 1.0 M HCl by Catechin Monomers from Commercial Green Tea Extracts

verfasst von: S. Nofrizal, Afidah A. Rahim, Bahruddin Saad, P. Bothi Raja, Affaizza M. Shah, S. Yahya

Erschienen in: Metallurgical and Materials Transactions A | Ausgabe 4/2012

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Abstract

The inhibitive action of commercial green tea extracts on mild steel (MS) in a 1.0 M hydrochloric acid solution was investigated by weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS). A high-performance liquid chromatographic (HPLC) analysis showed conclusively that of the eight catechin monomers and caffeine found in the original extracts, only four components were responsible for the inhibition of MS. The decreasing adsorption capacity of monomers on MS is related to the stereochemistry of molecules and the number of phenolic groups, and it is as follows: epigallocatechin gallate > epicatechin gallate > epigallocatechin > epicatechin. Adsorption of green tea extract constituent was found to follow Langmuir adsorption isotherm and the calculated Gibb’s free energy values indicated the physisorption of inhibitor over MS surface. Physisorption was supported well by the potential zero charge (PZC) and molecular surface energy-level calculations.
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Metadaten
Titel
Elucidation of the Corrosion Inhibition of Mild Steel in 1.0 M HCl by Catechin Monomers from Commercial Green Tea Extracts
verfasst von
S. Nofrizal
Afidah A. Rahim
Bahruddin Saad
P. Bothi Raja
Affaizza M. Shah
S. Yahya
Publikationsdatum
01.04.2012
Verlag
Springer US
Erschienen in
Metallurgical and Materials Transactions A / Ausgabe 4/2012
Print ISSN: 1073-5623
Elektronische ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-011-1030-3

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