Mathiyarasu, J. and Natarajan, R. and Palaniswamy, N. and Rengaswamy, N.S. (1997) Synergistic effect of citrate ethylene diamine phosphonic acid and Zn2+ on the inhibition of corrosion of mild steel in low chloride media. Bulletin of Electrochemistry, 13 (04). pp. 161-165. ISSN 0256-1654

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Abstract

Synergistic effect of citrate ethylene diamine phosphonic acid (CEDPA) and Zn2+ on the inhibition of corrosion of mild steel in water containing chloride ion of 60 ppm has been evaluated by weight loss, potentiostatic polarisation and electrochemical impedance spectroscopic methods. The weight loss studies have shown that neither the CEDPA nor Zn2+ has any inhibitive action individually but when they are combined together because of synergistic effect they give higher inhibition efficiency with increase in concentration. An optimal critical concentration of 200 ppm of CEDPA and 80 ppm of Zn2+ has been established to the maximum efficiency of 93 +- 2%. Potentiostatic polarization studies have confirmed this system acts as a mixed inhibitor. X-ray diffraction technique, UV-VIS-NIR spectra and luminescence spectra have revealed that this synergistic effect is due to the formation of Fe2+ -CEDPA complex on the metal surface at a critical concentration ratio of 2:5:1

Item Type:	Article
Uncontrolled Keywords:	Corrosion inhibition; Synergistic effect; Luminescence; Electrochemical impedance spectroscopy; Fe2+-CEDPA complex
Subjects:	Electrodics and Electrocatalysis
Divisions:	UNSPECIFIED
Depositing User:	ttbdu cecri
Date Deposited:	25 May 2012 09:12
Last Modified:	25 May 2012 09:12
URI:	http://cecri.csircentral.net/id/eprint/2754

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