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

IF 1.5 3区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Oxidation of Metals Pub Date : 2026-05-26 DOI:10.1007/s11085-026-10408-z

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

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Abstract

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.

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高温水中稀释区及大块合金52M包覆层氧化膜的特性

本研究在模拟压水堆（PWR）一次水中进行了325°C的暴露腐蚀试验，采用焊缝稀释区和大块金属合金52M焊缝覆盖层。对合金52M堆焊中稀释区和大块金属表面形成的氧化膜的性能进行了表征，分析了焊接成分稀释对整体氧化和局部氧化行为的影响机理。结果表明：52M合金复盖层稀释带试样表面形成FeCr2O4或FeCrNiO4颗粒状氧化物，内部形成较厚的富cr氧化层，并存在严重的局部氧化渗透；在52M合金覆盖层的大块金属试样上形成针状NiCr2O4和NiFe2O4外层和薄而致密的富cr氧化层。稀释区的低cr和高fe含量增强了局部氧化动力学，从而增加了在氧化物-基体界面处局部氧化渗透的深度和密度。

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来源期刊

Oxidation of Metals 工程技术-冶金工程

CiteScore

5.10

自引率

9.10%

发文量

审稿时长

2.2 months

期刊介绍： Oxidation of Metals is the premier source for the rapid dissemination of current research on all aspects of the science of gas-solid reactions at temperatures greater than about 400˚C, with primary focus on the high-temperature corrosion of bulk and coated systems. This authoritative bi-monthly publishes original scientific papers on kinetics, mechanisms, studies of scales from structural and morphological viewpoints, transport properties in scales, phase-boundary reactions, and much more. Articles may discuss both theoretical and experimental work related to gas-solid reactions at the surface or near-surface of a material exposed to elevated temperatures, including reactions with oxygen, nitrogen, sulfur, carbon and halogens. In addition, Oxidation of Metals publishes the results of frontier research concerned with deposit-induced attack. Review papers and short technical notes are encouraged.