Methodological Features of the Study of Hydrogen Permeation Through a Steel Membrane from an Acid Environment

The composition of the working environments was chosen for determining the parameters of hydrogen diffusion through a 20 steel membrane by the Dewanathan-Stahursky method: the anodic cell was filled with a 0.2M KOH+10 g/ dm3 Na2MoO4 solution, and the cathodic cell was filled with a 1M H2SO4 +10 g/ dm3 (NH2)2 CS solution. The effective coefficient of hydrogen diffusion through a membrane made of 20 steel increases in approx. 6 times with an increase in the current density of the cathodic polarization from 0 to 2 A/ dm2 . It takes into account not only the transfer of hydrogen through the membrane but also depends on the types of traps and duration of hydrogen stay in them. The 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.