Hydrogen permeability through steel membrane during corrosion in chloride-acetate solution under the influence of hydrogen sulfide, carbon dioxide, and mechanical stress
摘要
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. The permeability and effective diffusion coefficient of hydrogen were the lowest in a solution saturated with carbon dioxide. Adding hydrogen sulfide to the solution at a concentration from 100 mg/dm3 to saturation causes an increase in the hydrogen permeability through the membrane from 1.5 to 3.2 times, which is associated with the intensification of corrosion processes on the 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 hydrogen permeability depends, first, on the hydrogen sulfide concentration in the solution, which determines the corrosion and hydrogen charging rates of the steel.