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<p>The present work used a weld dilution zone and bulk metal of Alloy 52M weld overlay to conduct an exposure corrosion test in simulated pressurized water reactor (PWR) primary water at 325&#xa0;°C. The properties of the oxide film formed on the surface of the dilution zone and the bulk metal in Alloy 52M overlay were characterized, and the underlying mechanisms of welding composition dilution on general oxidation and localized oxidation behaviors were analyzed. The results showed that a FeCr<sub>2</sub>O<sub>4</sub> or FeCrNiO<sub>4</sub> outer granular oxide and a thicker Cr-rich inner oxide layer, as well as severe local oxidation penetration, were observed on the dilution zone specimen of the Alloy 52M overlay. The needle-like NiCr<sub>2</sub>O<sub>4</sub> and NiFe<sub>2</sub>O<sub>4</sub> outer layer and a thin compact Cr-rich oxide layer were formed on the bulk metal specimen of the Alloy 52M overlay. The low-Cr and high-Fe contents in the dilution zone enhance the local oxidation kinetics, thus increasing the depth and density of local oxidation penetration at the oxide-matrix interface.</p>

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The Characteristics of the Oxide Films Formed on the Dilution Zone and Bulk Alloy 52M Cladding in High-Temperature Water

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月26日

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  • Binkun Shan,
  • Hongyuan Li,
  • Shugang Zhang,
  • Chengtao Li,
  • Tongming Cui,
  • Yuanjie Tang,
  • Zhanpeng Lu

摘要

The present work used a weld dilution zone and bulk metal of Alloy 52M weld overlay to conduct an exposure corrosion test in simulated pressurized water reactor (PWR) primary water at 325 °C. The properties of the oxide film formed on the surface of the dilution zone and the bulk metal in Alloy 52M overlay were characterized, and the underlying mechanisms of welding composition dilution on general oxidation and localized oxidation behaviors were analyzed. The results showed that a FeCr2O4 or FeCrNiO4 outer granular oxide and a thicker Cr-rich inner oxide layer, as well as severe local oxidation penetration, were observed on the dilution zone specimen of the Alloy 52M overlay. The needle-like NiCr2O4 and NiFe2O4 outer layer and a thin compact Cr-rich oxide layer were formed on the bulk metal specimen of the Alloy 52M overlay. The low-Cr and high-Fe contents in the dilution zone enhance the local oxidation kinetics, thus increasing the depth and density of local oxidation penetration at the oxide-matrix interface.