Modeling of hydrogen trapping in the deformed Pd and Pd77Ag23 alloy

The effects of Pd and Pd77Ag23 alloy membrane microstructures on hydrogen permeation have been investigated using the electrochemical permeation method. Deformation and annealing have been used to modify the membrane microstructures. The delay of hydrogen permeation in palladium increases when the degree of deformation is increases. The annealing of deformed palladium and Pd77Ag23 accelerates hydrogen diffusion. The annealed metals release hydrogen more rapidly than deformed metals. Also, the Pd77Ag23 alloy needs more time to release hydrogen than pure palladium. The solubility of hydrogen increases in both palladium and Pd77Ag23 when the amount of deformation is increased. A hydrogen trapping model was developed, which allows the prediction of trends of hydrogen permeation through membranes having different structures.