Effect of FeCO3 corrosion product scale on hydrogen adsorption and permeation of pipeline steel in gaseous hydrogen-blended natural gas transportation

The corrosion product scale formed on the natural gas pipelines can significantly affect the hydrogen permeation and compatibility after blending hydrogen. However, the effects of the corrosion product scale on gaseous hydrogen adsorption and diffusion remains unclear. In this study, an integrated procedure for gaseous hydrogen permeation with corrosion scale is proposed. Then the hydrogen permeation kinetics of the pipeline steel covered with FeCO3 corrosion product scales was investigated. In addition, the kinetics of hydrogen adsorption on Fe and FeCO3 surfaces were investigated by molecular dynamics methods. The influence mechanism of FeCO3 scales on hydrogen permeation was proposed.