Abstract Various forms for the diffusion equation resulting from the void theory of the trapping of hydrogen in iron and steel are considered, and a numerical solution of one of these is given. Using this the quantity of hydrogen evolved in a given time from a cylindrical specimen is calculated and compared with experimental observations. It is shown that the model predicts satisfactorily a number of properties of the observed apparent diffusion coefficient.

The numerical solution of the diffusion equation from the void theory of hydrogen trapping in iron and steel accurately predicts observed properties of the apparent diffusion coefficient.

A numerical solution of the diffusion equation resulting from the void theory of the trapping of hydrogen in iron and steel

Key Takeaway: The numerical solution of the diffusion equation from the void theory of hydrogen trapping in iron and steel accurately predicts observed properties of the apparent diffusion coefficient.