Mani, N. and Iyer, S.V.K. and Lalbahadur, . (2003) Influence of anions on the inhibition of corrosion of zinc in acidic solutions by n-heterocyclics. Bulletin of Electrochemistry, 19 (02). pp. 53-60. ISSN 0256-1654

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Abstract

The influence of anions such as chloride and sulphate on the corrosion of zinc in 1 N HCl and 1 N H2SO4 by N-heterocyclics such as imidazole (1m), 2-methyl imidazole (M 1m) and benzimidazole (B 1m) has been studied using weight loss and gasometric measurements potentiodynamic polarization studies, a.c.impedance measurements and UV reflectance studies. Imidazoles are found to be more inhibitive in 1 N HCl than in 1 N H2SO4. The inhibition of corrosion of zinc by these compounds is found to be under mixed control, but predominantly under cathodic control. Trends in the increase of charge transfer resistence (Rt) and decrease in double layer capacitance (Cdl) values also indicate the absorption of these compounds on the metal surface. UV spectral studies were also carried out to establish the actual mechanism of inhibition of corrosion. The absorption of these compounds from both the acids on the surface of zinc obeys Temkin's absorption isotherm

Item Type:	Article
Uncontrolled Keywords:	N-heterocyclics; Corrosion inhibition; Absorption isotherm; Impedance spectroscopy; UV reflectance studies
Subjects:	Corrosion Science and Engineering
Divisions:	UNSPECIFIED
Depositing User:	ttbdu cecri
Date Deposited:	04 May 2012 11:25
Last Modified:	04 May 2012 11:25
URI:	http://cecri.csircentral.net/id/eprint/2479

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