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Effect of Grande Ronde Basalt Groundwater Composition and Temperature on the Corrosion of Low-Carbon Steel in the Presence of Basalt-Bentonite Packing

Published online by Cambridge University Press:  26 February 2011

R. P. Anantatmula
R. P. Anantatmula*
Affiliation:
Rockwell Hanford Operations, P.O.Box 800, Richland, WA 99352
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Abstract

The Basalt Waste Isolation Project (BWIP) is being conducted for the U.S. Department of Energy (DOE) by Rockwell Hanford Operations. The effect of Grande Ronde Basalt groundwater composition and temperature on the corrosion rate of American Iron and Steel Institute (AISI) 1020 steel in basalt-bentonite packing was investigated as part of the Containment Materials Testing Program of the BWIP. The studies were based on a Plackett-Burman statistical screening design, the purpose of which is to identify the important variables affecting a process and to use this information to guide future investigative efforts. For the present studies, four anions (Cl−, F−, SO4−, and CO3−) and temperature were selected as the initial variables affecting corrosion. A minimum and a maximum value was chosen for each variable. The minimum value was 0 mg/L for the anions and 100 °C for the temperature. The maximum values were 780, 76, 576, and 120 mg/L, respectively, for Cl−, F−, SO4−, and CO3−, and 250 °C for the temperature. Analysis of the data revealed that temperature is the only statistically significant variable affecting corrosion of low-carbon steel in basalt groundwater in the composition range of the anions tested. Increasing the temperature from 100 °C to 250 °C decreased the total corrosion by a factor of seven to ∼5O mg/dm2 independent of the water composition. This is attributed to a strongly adherent layer of iron- and silicon-rich clay on the surface of the steel formed by a reaction of the steel surface with the packing material as observed in previous studies.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 44: Symposium N – Scientific Basis for Nuclear Waste Management VIII , 1984 , 273
Copyright
Copyright © Materials Research Society 1985

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References

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