Abstract
Abstract Previous corrosion studies identified carbon steels as promising materials for the manufacture of long-lived, high-level waste containers that could act as an engineered barrier in a rock-salt repository. In the present work, the effect of electron beam (EB) and tungsten-inert-gas (TIG) welding (potential container closure techniques) on the corrosion behavior of the preselected, fine-grained structural steel TStE355 (DIN 1.0566) was investigated. The steel was examined in three material conditions such as unwelded, as-welded, and welded plus stress-relief thermal-treated in a disposal-relevant magnesium chloride (MgCl2)-rich brine at 150°C and a gamma radiation field of 10 Gy/h. Results indicated that the unwelded steel was resistant to pitting corrosion in the sense of an active-passive corrosion element, and its general corrosion implied corrosion allowances acceptable for thick-walled containers. The EB- and TIG-welding significantly decreased the corrosion resistance of the steel. The as-wel...
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