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<p>Martensitic steel (SUS403) steel is widely used in non-core structural components of nuclear reactors, where its mechanical strength and corrosion resistance are critical. This study systematically investigates the corrosive behavior of commercially available chemical decontaminating reagents, Hydrazine-Based Reductive Metal Ion Decontamination (HyBRID), oxalic acid (OA), and Canadian Decontamination and Remediation (CANDEREM), on SUS403. Weight loss analysis, Fe ion dissolution, corrosion rate, and corrosion depth were assessed over 3, 6, and 9&#xa0;h of exposure at 95&#xa0;°C. The Fe ion concentrations in solution were 52.29, 90.35, and 4.11&#xa0;ppm after 9 h for HyBRID, OA, and CANDEREM, respectively. The corrosion rates measured were 0.87, 0.87, and 0.05&#xa0;mm/y, while the maximum corrosion depths were reached up to 0.90, 0.89, and 0.05&#xa0;μm, respectively. Surface morphology analysis revealed significant material degradation in OA and HyBRID, whereas CANDEREM exhibited minimal corrosion due to its chelating properties. The main findings confirm that while HyBRID and OA are effective in material removal, they lead to substantial corrosion, whereas CANDEREM offers a controlled decontamination process with minimal material degradation, making it a preferred choice for maintaining reactor component integrity.</p>

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Corrosive Behavior of Chemical Decontaminating Reagents on SUS403 Steel

  • 期刊论文

  • 发表日期：

    2025年10月2日

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  • Kamal Asghar,
  • Miguta Faustine Ngulimi,
  • Sion Kim,
  • Bum Kyoung Seo,
  • Changhyun Roh

摘要

Martensitic steel (SUS403) steel is widely used in non-core structural components of nuclear reactors, where its mechanical strength and corrosion resistance are critical. This study systematically investigates the corrosive behavior of commercially available chemical decontaminating reagents, Hydrazine-Based Reductive Metal Ion Decontamination (HyBRID), oxalic acid (OA), and Canadian Decontamination and Remediation (CANDEREM), on SUS403. Weight loss analysis, Fe ion dissolution, corrosion rate, and corrosion depth were assessed over 3, 6, and 9 h of exposure at 95 °C. The Fe ion concentrations in solution were 52.29, 90.35, and 4.11 ppm after 9 h for HyBRID, OA, and CANDEREM, respectively. The corrosion rates measured were 0.87, 0.87, and 0.05 mm/y, while the maximum corrosion depths were reached up to 0.90, 0.89, and 0.05 μm, respectively. Surface morphology analysis revealed significant material degradation in OA and HyBRID, whereas CANDEREM exhibited minimal corrosion due to its chelating properties. The main findings confirm that while HyBRID and OA are effective in material removal, they lead to substantial corrosion, whereas CANDEREM offers a controlled decontamination process with minimal material degradation, making it a preferred choice for maintaining reactor component integrity.