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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 ethylene glycol and water-ethylene glycol solutions of HCl with a constant ionic strength, which contain As(V) predominantly in the form of H 3 AsO 4 . 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 certain 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.

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