Jeyaprabha, C. and Sathiyanarayanan, S. and Muralidharan, S. and Venkatachari, G. (2006) Corrosion Inhibition of Iron in 0.5 mol L-1 H2SO4 by Halide Ions. Journal of the Brazilian Chemical Society, 17 (1). pp. 61-67. ISSN 0103-5053

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Abstract

O efeito de inibição de íons haletos, tais como iodeto, brometo e cloreto, na corrosão de ferro em solução 0,5 mol L-1 de H2SO4, e o comportamento da adsorção desses íons na superfície do eletrodo, foram estudados pelos métodos de polarização e de impedância. Foi observada uma inibição de aproximadamente 90% para íons iodeto a 2,5 × 10-3 mol L-1 e para íons brometo a 10 × 10-3 mol L-1, e de 80% para íons cloreto a 2,5 × 10-3 mol L-1. O efeito da inibição aumenta com o aumento da concentração dos íons haletos I– e Br–, mas decresce no caso do Cl–, para concentrações maiores que 5 ×10-3 mol L-1. Os valores de capacitância de dupla camada diminuíram consideravelmente na presença dos íons haletos, o que indicou que esses ânions são adsorvidos no ferro no potencial de corrosão. The inhibition effect of halide ions such as iodide, bromide and chloride ions on the corrosion of iron in 0.5 mol L-1 H2SO4 and the adsorption behaviour of these ions on the electrode surface have been studied by polarization and impedance methods. It has been found that the inhibition of nearly 90% has been observed for iodide ions at 2.5 × 10-3 mol L-1, for bromide ions at 10 × 10-3 mol L-1 and 80% for chloride ions at 2.5 × 10-3 mol L-1. The inhibition effect is increased with increase of halide ions concentration in the case of I– and Br– ions, whereas it has decreased in the case of Cl– ion at concentrations higher than 5 × 10-3 mol L-1. The double layer capacitance values have decreased considerably in the presence of halide ions which indicate that these anions are adsorbed on iron at the corrosion potential.

Item Type:	Article
Uncontrolled Keywords:	corrosion inhibition; iron; sulphuric acid; halide ions
Subjects:	Corrosion Science and Engineering
Divisions:	UNSPECIFIED
Depositing User:	ttbdu cecri
Date Deposited:	01 Mar 2012 07:07
Last Modified:	01 Mar 2012 07:07
URI:	http://cecri.csircentral.net/id/eprint/734

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