Author:
Daub Kevin,Zhang Xueyuan,Noël James J.,Wren J. C.
Abstract
Carbon steel waste containers have been proposed in a number of national nuclear waste management programs. Although redox conditions in the sedimentary clay environments in which these containers would be placed will be anoxic, gamma irradiation would produce oxidizing conditions at the container surface. The effect of gamma radiation on carbon steel corrosion in de-aerated solutions was studied as a function of pH and temperature. The corrosion kinetics were studied by monitoring the corrosion potential (Ecorr) in-situ, and periodically performing linear polarization and electrochemical impedance spectroscopy measurements to determine polarization resistances. The surfaces, and cross sections of irradiated carbon steel coupon samples were also examined using SEM, XPS, and Raman spectroscopy. Preliminary results indicate that gamma irradiation increases the corrosion potential from a region where the anodic oxidation is limited to Fe(OH)2 and Fe3O4 to a region where the oxidation of Fe(OH)2 to gamma-FeOOH and Fe3O4 to gamma-Fe2O3 is possible.
Publisher
The Electrochemical Society
Cited by
2 articles.
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