Methodological features of the study of hydrogen permeability through a steel membrane from an acidic environment

Keywords

hydrogen permeability, effective diffusion coefficient for hydrogen, steel 20, cathodic polarization.

Cite as

Khoma M. S., Ivashkiv V. R., Chuchman M. R., Ratska N. B., and Vasyliv Kh. B. Methodological features of the study of hydrogen permeability through a steel membrane from an acidic environment. Physicochemical Mechanics of Materials. 2023. 59(4), 51-58.

https://doi.org/10.15407/pcmm2023.04.051

Abstract

The composition of the working environments was chosen for determining the parameters of hydrogen diffusion through a steel 20 membrane by the Dewanathan–Stahurskii method: the anodic cell was filled with a solution of 0.2 M KOH + 10 g/dm³ Na₂MoO₄, and the cathodic cell was filled with a solution of 1 M H₂SO₄ +10 g/dm³ (NH₂)₂СS. It is shown, that the effective diffusion coefficient of hydrogen through a membrane made of steel 20 increases by ~ 6 times with an increase in the current density of the cathodic pola­rization from 0 to 2 A/dm². The effective diffusion coefficient takes into account not only the transfer of hydrogen through the membrane, but also depends on the types of traps and the duration of hydrogen’s stay in them. Absorption of hydrogen is accompanied by an increase in the defectiveness of the metal structure, which changes the conditions of hydrogen diffusion. The dependence of hydrogen permeability through steel on time was evaluated using the Laplace equation for different probable values of the effective diffu­sion coefficient and hydrogen concentration. The obtained experimental results agree with theoretical calculations.

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