The aim of this thesis was to investigate the behavior of hydrogen in ARMCO-iron. Hydrogen can accumulate in the metal at microstructural traps. Because of their bonding energy to hydrogen, these traps can be classified into reversible and irreversible traps. Quite contrary to reversible traps, at irreversible traps the hydrogen will be bonded permanently and so it is important to differ between these types of traps. For the characterization of traps three different states of ARMCO-iron were investigated: Annealed, deformed and recrystallized state. The characterization of the microstructure was done by a light optical microscope, a scanning electron microscope and a transmission electron microscope. The diffusion behavior was determined based on (dis)charging cycles, done by the electrochemical permeation technique of Devanathan and Stachurski. After literature research an evaluation process was chosen and reversible traps could be distinguished from irreversible traps. The investigation revealed that based on the whole fraction of traps, the annealed and the recrystallized state have more irreversible than reversible traps. The deformed state showed the exactly reverse behavior and contains more reversible traps.