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51318-11370-Electrochemical Measurements of Steel Corrosion for Modeling H2 Generation

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  • 51318-11370-Electrochemical Measurements of Steel Corrosion for Modeling H2 Generation
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We are using electrochemical methods to measure the corrosion rates of low alloy steels, stainless steels, and Zircaloy-4 that can be used to represent H2 generation rates under the range of Eh-pH conditions that could occur in a disposal system.

Product Number: 51318-11370-SG
Author: V.K. Gattu / W.L. Ebert / N. Tehrani / J.E. Indacochea
Publication Date: 2018
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$20.00

The H2 generation rate due to anoxic metal corrosion and radiolysis is a critical parameter value in the fuel degradation model to be used in performance analyses of waste disposal facilities. We are using electrochemical methods to measure the corrosion rates of low alloy steels, stainless steels, and Zircaloy-4 that can be used to represent H2 generation rates under the range of Eh-pH conditions that could occur in a disposal system. Potentiostatic tests are being conducted to monitor the anodic corrosion current over several days as the surface corrodes at an imposed voltage, with electrochemical impedance spectroscopy performed periodically to quantify changes in the surface electrical properties. The corroded surfaces are examined with scanning electron microscopy after the test to relate the electrochemical measurements to physical changes. Results of tests with AISI 4320 in a 10 mM NaCl solution made using commercial pH 4 buffer solution at several imposed potentials are presented as an example of the experimental method and the dependence of the corrosion rate on the surface potential. The electrochemical results are compared with the results of coupon immersion tests conducted with the same material in the same solution for up to 73 days.

Key words: steel corrosion, potentiostatic tests, immersion tests

The H2 generation rate due to anoxic metal corrosion and radiolysis is a critical parameter value in the fuel degradation model to be used in performance analyses of waste disposal facilities. We are using electrochemical methods to measure the corrosion rates of low alloy steels, stainless steels, and Zircaloy-4 that can be used to represent H2 generation rates under the range of Eh-pH conditions that could occur in a disposal system. Potentiostatic tests are being conducted to monitor the anodic corrosion current over several days as the surface corrodes at an imposed voltage, with electrochemical impedance spectroscopy performed periodically to quantify changes in the surface electrical properties. The corroded surfaces are examined with scanning electron microscopy after the test to relate the electrochemical measurements to physical changes. Results of tests with AISI 4320 in a 10 mM NaCl solution made using commercial pH 4 buffer solution at several imposed potentials are presented as an example of the experimental method and the dependence of the corrosion rate on the surface potential. The electrochemical results are compared with the results of coupon immersion tests conducted with the same material in the same solution for up to 73 days.

Key words: steel corrosion, potentiostatic tests, immersion tests

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