Effect of ion irradiation and implantation of H and He on the corrosion behavior of austenitic stainless steel

Nemoto, Yoshiyuki  ; Miwa, Yukio; Kaji, Yoshiyuki  ; Tsukada, Takashi 

The aim of this work is to evaluate corrosion behavior of irradiated materials these would be used in spallation neutron sources. Solution annealed high purity Fe-18Cr-12Ni specimens were used in this study. Ni, H+ and He ions were irradiated at 473 to 773K. After corrosion procedure, the specimens were examined with atomic force microscope (AFM) to evaluate corrosion behavior. It was shown that the corroded volume of irradiated area increased with radiation damage. Higher H content at lower temperature accelerated corrosion, but H at higher temperature did not accelerate corrosion. He suppressed corrosion, and corroded volume was larger for the specimens irradiated at higher temperature than these at lower temperature. It is suggested from this study that H and He affect the corrosion behavior of irradiated alloy.