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Effect of Na₃PO₄ on the corrosion inhibition efficiency of EDTA – Zn²⁺ system for carbon steel in aqueous solution

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Title Effect of Na₃PO₄ on the corrosion inhibition efficiency of EDTA – Zn²⁺ system for carbon steel in aqueous solution
 
Creator Umamathi, T
Selvi, J Arockia
Kanimozhi, S Agnesia
Rajendran, Susai
Amalraj, A John
 
Subject Carbon steel
Corrosion inhibition
EDTA
Na₃PO₄
Synergistic effect
 
Description 560-565
The synergistic effect of sodium salt of ethylene diamine tetra acetic acid (EDTA) and Zn²⁺ in controlling corrosion of carbon steel in an aqueous environment containing 60 ppm Cl⁻ was evaluated by weight loss and electro chemical methods. A formulation consisting of 50 ppm EDTA and 50 ppm Zn²⁺ was observed to achieve 73% inhibition efficiency. Influence of Na₃PO₄ on EDTA - Zn²⁺ was studied and IE was found to increase from 73 to 98%. A suitable mechanism of corrosion inhibition has been proposed which is based on the results obtained from weight loss method, polarization study, AC impedance spectra and FTIR spectra. The protective film consisted of Fe²⁺ - EDTA,
Fe²⁺ - Na₃PO₄ complexes and Zn(OH)₂.
 
Date 2009-01-28T07:11:51Z
2009-01-28T07:11:51Z
2008-11
 
Type Article
 
Identifier 0971–457X
http://hdl.handle.net/123456789/2870
 
Language en_US
 
Publisher CSIR
 
Source IJCT Vol.15(6) [November 2008]