Biochemical contributions to corrosion of carbon steel and Alloy 22 in a continual flow system
- Lawrence Livermore National Lab., CA (United States)
Microbiologically influenced corrosion (MIC) may decrease the functional lifetime of nuclear waste packaging materials in the potential geologic repository at Yucca Mountain (YM), Nevada. Biochemical contributions to corrosion of package materials are being determined in reactors containing crushed repository- site rock with the endogenous microbial community, and candidate waste package materials. These systems are being continually supplied with simulated groundwater. Periodically, bulk chemistries are analyzed m the system outflow, and surfacial chemistries are assessed m withdrawn material coupons. Both Fe and Mn dissolved from C1020 coupons under conditions that included the presence of YM microorganisms. Insoluble corrosion products remained in a reduced state at the coupon surface, indicating at least a localized anoxic condition; soluble reduced Mn and Fe were also detected in solution, while precipitated and spalled products were oxidized. Alloy 22 surfaces showed a layer of chrome oxide, almost certainly in the Cr(III) oxidation state, on microcosm-exposed coupons, while no soluble chrome was detected in solution. The results of these studies will be compared to identical testing on systems containing sterilized rock to generate, and ultimately predict, microbial contributions to waste package corrosion chemistries.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 696933
- Report Number(s):
- CONF-990401-; TRN: IM9946%%319
- Resource Relation:
- Conference: Corrosion 1999 conference, San Antonio, TX (United States), 25 Apr 1999; Other Information: DN: 1 CD-ROM. Operating Systems: Windows 3.1, `95, `98 and NT; Macintosh; and UNIX; PBD: 1999; Related Information: Is Part Of Corrosion 99: Proceedings; PB: [3500] p.
- Country of Publication:
- United States
- Language:
- English
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