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

Journal of the Brazilian Chemical Society

Jeyaprabha, C.¹  Central Electrochemical Research Institute, Karaikudi, India¹  Venkatachari, G.¹  Muralidharan, S.¹  Sathiyanarayanan, S.¹ 

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

DOI  :  10.1590/S0103-50532006000100009

学科分类：化学（综合）

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】

Unknown