Corrosion inhibition of iron in 0.5 mol L-1 H2SO4 by halide ions

Journal of the Brazilian Chemical Society

C. Jeyaprabha¹  S. Sathiyanarayanan¹  S. Muralidharan¹  G. Venkatachari¹ 

[1] ,Central Electrochemical Research InstituteKaraikudi,India

关键词: corrosion inhibition;    iron;    sulphuric acid;    halide ions;   

DOI  :  10.1590/S0103-50532006000100009

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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