One of the typical materials for components, Stainless Steel (SS)-304 was used as a specimen and deuterium was charged by various methods, water absorption, ion irradiation and electrolysis. The chemical states of iron, chromium, nickel and oxygen on SS-304 was evaluated by X-ray photoelectron spectroscopy (XPS). The thermal desorption spectroscopy (TDS) was also applied to the evaluation of the thermal desoprtion behavior of deuterium from SS-304 and pure iron. The hydrogen behavior on SS-304 was compared with that on pure iron. Metal oxide and oxyhydroxide, FeOOD or CrOOD, were found to be formed on the surface of SS-304 by XPS. The oxyhydroxide was dominant on the surface of the sample with electrolysis. However, metal oxide was observed on the surface of SS-304 after D2O water adsorption. TDS revealed that large peak was found on the non pretreated sample with electrolysis and would be ascribed to the deuterium release from oxyhydroxide. The other peak was also observed at higher temperature on all the samples except for the sample with ion irradiation. This peak would be ascribed to the release of deuterium retained in the sample. For the pure iron, the amount of retained deuterium in iron was about 1.5 times larger than that in SS-304. It can be concluded that the oxygen layer and chemical state of hydrogen isotopes would play an important role for the retention of hydrogen isotopes in SS-304.
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