Abstract
The chemical stability of base metals in a nuclear facility is critical for chemical decontamination because the process typically utilizes a corrosive solution as a reaction medium. An electrochemical corrosion study on SA106 Grade B (SA106B) carbon steel, a feeder pipe material in a Canadian Deuterium Uranium (CANDU) pressurized heavy water reactor, was performed to examine its stability in a hydrazine (N2H4)-based reductive metal ion decontamination (HyBRID) process. The corrosion rate of SA106B in the HyBRID process was reduced by introducing corrosion inhibitors, such as chrysoidine G (CG) and CI#30. The corrosion current (Icorr) of SA106B in the H2SO4-N2H4 solution, a reaction medium of the HyBRID process, was reduced to approximately 30% and 20% in the presence of CG and CI#30, respectively. The Icorr obtained in the HyBRID solution containing the corrosion inhibitor was comparable to that obtained in the organic acid solution used for the commercial process, Canadian decontamination and remediation (CAN-DEREM). Our results indicate that sufficient material stability of SA106B against corrosion during the HyBRID process can be realized by adding a corrosion inhibitor for the chemical decontamination of the CANDU reactor.
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This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean Government (MSIT) (RS-2022-00155421).
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Kim, SW., Park, SY., Roh, CH. et al. Effect of corrosion inhibitors on SA106 Grade B carbon steel in H2SO4-N2H4 solution for the hydrazine-based reductive metal ion decontamination process. Chem. Pap. 76, 6517–6522 (2022). https://doi.org/10.1007/s11696-022-02338-2
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DOI: https://doi.org/10.1007/s11696-022-02338-2