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Effect of corrosion inhibitors on SA106 Grade B carbon steel in H2SO4-N2H4 solution for the hydrazine-based reductive metal ion decontamination process

Sung-Wook Kim, Sang-Yoon Park, Chang-Hyun Roh, Ji-Hyung Shim, and Sun-Byeong Kim

Korea Atomic Energy Research Institute, Yuseong-gu, Daejeon, Republic of Korea

 

E-mail: swkim818@kaeri.re.kr

Received: 1 May 2022  Accepted: 8 June 2022

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.

Graphical abstract

Keywords: Chemical decontamination; Hydrazine-based reductive metal ion decontamination (HyBRID) process; Carbon steel; Corrosion inhibitor; Electrochemistry

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-022-02338-2

 

Chemical Papers 76 (10) 6517–6522 (2022)

Tuesday, May 28, 2024

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