Corrosion inhibition by phosphonic acid –Zn 2+ systems for mild steel in chloride medium

Corrosion inhibition by phosphonic acid –Zn 2+ systems for mild steel in chloride medium The inhibition efficiencies of 2-carboxyethyl phosphonic acid (2 CEPA) - Zn2+ system and ethyl phosphonic acid (EPA) - Zn2+ system in controlling corrosion of mild steel in a neutral aqueous environment containing 60ppm CI– have been compared. Polarization study reveals that both the systems function as mixed inhibitors. The inhibition efficiencies of these systems decrease with period of immersion due to the dissolution of the protective film as the period of immersion increases. The 2 CEPA - Zn2+ system has a better inhibition efficiency than the EPA–Zn2+ system. This is due to the fact that the amount of Fe2+– 2 CEPA complex present on the metal surface is higher than that of Fe2+– EPA complex, as revealed by fluorescence spectra. The molecular size of the iron phosphonate complex exercises a greater influence than the electronic (inductive) effect of the substituent in controlling corrosion of mild steel in chloride environment. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Anti-Corrosion Methods and Materials Emerald Publishing

Corrosion inhibition by phosphonic acid –Zn 2+ systems for mild steel in chloride medium

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Publisher
Emerald Publishing
Copyright
Copyright © 2000 MCB UP Ltd. All rights reserved.
ISSN
0003-5599
DOI
10.1108/00035590010361764
Publisher site
See Article on Publisher Site

Abstract

The inhibition efficiencies of 2-carboxyethyl phosphonic acid (2 CEPA) - Zn2+ system and ethyl phosphonic acid (EPA) - Zn2+ system in controlling corrosion of mild steel in a neutral aqueous environment containing 60ppm CI– have been compared. Polarization study reveals that both the systems function as mixed inhibitors. The inhibition efficiencies of these systems decrease with period of immersion due to the dissolution of the protective film as the period of immersion increases. The 2 CEPA - Zn2+ system has a better inhibition efficiency than the EPA–Zn2+ system. This is due to the fact that the amount of Fe2+– 2 CEPA complex present on the metal surface is higher than that of Fe2+– EPA complex, as revealed by fluorescence spectra. The molecular size of the iron phosphonate complex exercises a greater influence than the electronic (inductive) effect of the substituent in controlling corrosion of mild steel in chloride environment.

Journal

Anti-Corrosion Methods and MaterialsEmerald Publishing

Published: Dec 1, 2000

Keywords: Corrosion inhibitors; Acids; Mild steel

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