The influence of low-alloy pipe steel hydrogen saturation conditions on the sorption process

The kinetics of hydrogen sorption and desorption during electrolytic hydrogen saturation of steel grade 09G2C has been studied. A method for determining the effective hydrogen diffusion coefficient and a method for calculating the concentration profile over the section of a cylindrical sample are proposed. It is shown that the equilibrium concentration of hydrogen at a pressure of 25 MPa in the test material without applied stresses does not exceed 1 ppm. The influence of the stress-strain state on the sorption process during hydrogen saturation from the gas phase has been studied. A method is proposed for quantifying the equilibrium hydrogen concentration depending on pressure and the level of tensile stresses, taking into account influence of plastic deformation.