Hydrogen Diffusion through a Steel Membrane in Ethylene
Glycol Solutions of Hydrochloric Acid Containing Sodium
Hydroarsenate: The Effect of Anodic Polarization

V. I. Vigdorovich^z, L. E. Tsygankova, and E. Yu. Kopylova

Tambov State University, Tambov, Russia

Received December 1, 2003; in final form, July 1, 2004

Abstract—The kinetics of the hydrogen evolution reaction on iron and the hydrogen diffusion rate (i_H) through
a membrane of steel 3 are studied. The study is carried out in conditions of anodic polarization (E), in ethyl-
ene glycol and water–ethylene glycol solutions of HCl with a constant ionic strength, which contain As(V) pre-
dominantly in the form of H₃AsO₄. It is shown that the dependence of i_H on E passes through a maximum in
media with different concentrations of water and HCl, different solvation form of the proton, and different
nature of species that solvate the working surface of the membrane. The effect of E on i_H disappears in a cer-
tain range of anodic potentials. The presence of the maximum is shown to be due to the formation of two forms
of adsorbed hydrogen (H^r, H^s). That i_H is independent of E is connected with chemical dissolution of the
membrane’s working side.

Key words: iron, hydrogen, recombination, diffusion, membrane, arsenic, anodic polarization

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