CORROSION STUDIES ON PACKAGING MATERIALS FOR HIGH LEVEL WASTES
To determine suitable materials for the development of HLW packagings with a barrier function in a salt repository also under accident conditions, the corrosion behavior of various metallic materials in salt brines was examined. The corrosion studies were performed in two phases. During the first phase selective studies were made at 170 degrees C on three nickel-base alloys and a mild steel as well as on the materials Ti 99.8-Pd and the steel X1 CrMoTi 182 (ELA-ferrite). To have stringent test conditions for these selective studies, a salt brine was used as the corrosive medium which contained much more MgCl-2 (45 wt.%) than in the salt brines to be expected in accidents (24 - 35 wt.& MgCl-2). During the second phase of the investigation the materials chosen in the selective studies, Hastelloy C 4, Ti 99.8-Pd and mild steel (No. 1.0566) as well as three cast materials were examined in detail in a quinary salt brine probably encountered in accidents (Q-brine containing 26.5 wt.% MgC1-2). The corrosion behavior of the materials was studied at various temperatures (90 degrees C, 170 degrees C) with and without gamma irradiation of the corrosive medium. It can be stated from the investigations performed so far that the development of HLW packagings having the function of a barrier in the repository seems to be feasible if one uses e.g. material pairs containing Ti 99.8-Pd or Hastelloy C 4.
Bibliographic Reference: EUROPEAN APPLIED RESEARCH REPORTS - NUCLEAR SCIENCE AND TECHNOLOGY SECTION, VOL. 5 (1983), NO. 2, PP. 175-222 (EUR 8657 E).
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Record Number: 1989122015000 / Last updated on: 1987-01-01
Available languages: en