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96097 LOCALIZED CORROSION INITIATION, PROPAGATION, AND REPASSIVATION OF CORROSION RESISTANT HIGH-LEVEL NUCLEAR WASTE CONTAINER MATERIALS

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Product Number: 51300-96097-SG
ISBN: 96097 1996 CP
Author: D.S. Dunn, G.A. Cragnolino, N. Sridhar
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The initiation and repassivation of pitting and crevice corrosion of two candidate high-level nuclear waste container materials, type 316L stainless steel and alloy 825, were examined under a range of environmental conditions possible in a repository. The initiation and repassivation potentials for localized corrosion in short-term tests were determined to be a function of temperature, chloride concentration, and potential. Under long-term potentiostatic conditions, pitting and crevice corrosion were initiated at potentials much lower than those measured in short-term tests. Crevice corrosion occurred preferential y over pitting corrosion. Similar results were obtained when creviced specimens were connected through a zero resistance ammeter to a boldly exposed cathode of the same material. Localized corrosion was only observed when the potential of the creviced specimen was higher than the repassivation potential. Keywords: high-level nuclear waste, stainless steel, alloy 825, localized corrosion, pitting corrosion, crevice corrosion
The initiation and repassivation of pitting and crevice corrosion of two candidate high-level nuclear waste container materials, type 316L stainless steel and alloy 825, were examined under a range of environmental conditions possible in a repository. The initiation and repassivation potentials for localized corrosion in short-term tests were determined to be a function of temperature, chloride concentration, and potential. Under long-term potentiostatic conditions, pitting and crevice corrosion were initiated at potentials much lower than those measured in short-term tests. Crevice corrosion occurred preferential y over pitting corrosion. Similar results were obtained when creviced specimens were connected through a zero resistance ammeter to a boldly exposed cathode of the same material. Localized corrosion was only observed when the potential of the creviced specimen was higher than the repassivation potential. Keywords: high-level nuclear waste, stainless steel, alloy 825, localized corrosion, pitting corrosion, crevice corrosion
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