Ni-Cr-Mo alloys (e.g. C-22, C-4 and C-276) are considered candidate materials for nuclear waste containers because they offer excellent resistance to localized attack in conditions that can be encountered at
the permanent repository site. Electrochemical and standard immersion tests showed that the most resistant of the studied alloys to localized attack was C-22 alloy and the less resistant was C-4 alloy. It was important to determine if long time exposure to low temperatures (below 500°C) would be detrimental in the resistance of these alloys to localized attack (pitting and crevice corrosion). After aging for 40,000 h at 427°C none of these alloys showed precipitation of a second phase (such as carbides or ...
Keywords: nuclear waste repository, nickel based alloys, corrosion rate, localized corrosion, aging, thermal stability, mechanical properties, weldments.