Abstract
Leachability tests were carried out in de-mineralized water under dynamic and static conditions to understand the selective elemental leaching behaviour of metal waste form (MWF) alloys of D9 stainless steel with 5 to 17 wt% zirconium (Zr). The dynamic tests were carried out at 90 � Cf or 260 days while the static tests were carried out at 90 � C and 200 � C for 90 days. The analysis of the leachate solutions by inductively coupled plasma optical emission spectroscopy (ICP-OES) showed absolutely no leaching of the alloying elements. The surface of the MWF specimens were characterized by scanning electron microscopy attached with energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy and atomic force microscopy. The results revealed that a stable Zr rich oxide film that formed on the MWF surface protected the alloys from selective leaching. The thickness and intensity of the oxide scale was found to be higher after static leachability testing at 200 � C.
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