Fe-saponite growth on low-carbon and stainless steel in hydrothermal-bentonite experiments
作者： M.C. Cheshire , F.A. Caporuscio , C.F. Jové Colón , K.E. Norskog
DOI: 10.1016/J.JNUCMAT.2018.09.038
关键词:
摘要: Abstract Hydrothermal experiments on engineered barrier system (EBS) materials were conducted to characterize high temperature interactions between bentonite and candidate waste container steels (304SS, 316SS, low-C steel) for deep geological disposition of nuclear spent fuel. performed using Dickson reaction cells at temperatures pressure up 300 °C 15–16 MPa, respectively, four six weeks. Wyoming was saturated with a 1900 ppm K-Ca-Na-Cl solution in combination stainless steel coupons. Authigenic Fe-saponite precipitated utilizing as growth substrate Fe being supplied by corrosion. Concurrent formation, sulfides from sulfide-bearing fluids, pyrite dissolution, near the interface. Sulfide mineral formation is dependent composition: produced pentlandite ((Ni, Fe)9S8) millerite (NiS), whereas low C generated pyrrhotite (Fe7S8). The presence suggests highly reduced environments steel-clay interface potentially influencing overall corrosion rates (re)passivation mechanisms. Results this research show that material may act response during hydrothermal barriers.
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