Hydrogen permeability through steel membranes during corrosion in chloride-acetate solution under the influence of hydrogen sulphide, carbon dioxide and mechanical stress

Hydrogen permeability through a steel 20 membrane during corrosion in a chloride-acetate solution under the influence of dissolved CO2 and H2S and mechanical stress was investi­gated. It was established that the permeability and effective diffusion coefficient of hydro­gen are the lowest in a solution saturated with carbon dioxide. Adding hydrogen sulfide to the solution at a concentration from 100 mg/dm3 to saturation leads to an increase in the permeability of hydrogen through the membrane from 1.5 to 3.2 times, which is associated with the intensification of corrosion and hydrogenation of the charging surface. At the same time, the effective hydrogen diffusion coefficient is stable. The applied mechanical stress increases the subsurface concentration and permeability of hydrogen atoms in the metal. The penetration of hydrogen depends, first of all, on the hydrogen sulfide con­cen­tration in the solution, which determines the corrosion and hydro­genation rates of the steel.