Abstract
Results from deuterium permeation through 309S stainless steel have been combined with oxide growth and characterization information to establish the effects of surface oxides on permeation. Permeation results for 0.25 mm thick diaphragms were obtained using an all-metal, ion-pumped vacuum system and a quadrupole mass spectrometer. The temperature range covered was 250 to 450°C with an upstream deuterium pressure of 100 torr. Analysis by sputter-through Auger electron spectroscopy (AFS) revealed that some oxides were reduced or altered by the permeation process. The study included oxide thicknessess of 100 to 2500 Å grown by various procedures. Other characterization techniques employed were proton-induced X-ray spectroscopy (PIX), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The oxides investigated were found to have only a minor effect on the measured permeabilities.
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