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<p>To understand the influence of surface roughness on the corrosion properties of ENiCrFe-7 weld overlay cladding material, the corrosion behavior was studied by electrochemical methods at room temperature and immersion tests in high-temperature water. The results show that the surface roughnesses of various materials are 1400&#xa0;μm for 100#, 420&#xa0;μm for 1000# and 24&#xa0;μm for the polished sample. The greater the roughness is, the poorer the corrosion resistance (<i>E</i><sub>corr</sub>) becomes at room temperature. In a water environment at higher temperatures, the rate of weight gain gradually increases; that is, the corrosion resistance decreases with increasing roughness, and the thickness of the oxide film also increases. On the other hand, the number of larger particles on the surface gradually decreases with decreasing roughness. Finally, the surface morphology changes from particles in the ground samples to strip-like in the polished sample in a water environment at high temperatures. Finally, in the nuclear power plant, the corrosion resistance of ENiCrFe-7 weld overlay cladding material decreases both at room temperature and at higher temperatures with increasing roughness. In addition, the oxide film is mainly composed of Cr<sub>2</sub>O<sub>3</sub>, FeCr<sub>2</sub>O<sub>4</sub>, Fe<sub>3</sub>O<sub>4</sub>, Fe and metallic Ni in high-temperature water.</p>

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Influence of Surface Roughness on the Corrosion Behavior of ENiCrFe-7 Weld Overlay Cladding Materials

  • 期刊论文

  • 发表日期：

    2025年5月22日

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  • Peiliang Guo,
  • Peng Zhang,
  • Jianqiang Zhang,
  • Feng Yue,
  • Xinyu Nie,
  • Ruichun Chi,
  • Ming Fu

摘要

To understand the influence of surface roughness on the corrosion properties of ENiCrFe-7 weld overlay cladding material, the corrosion behavior was studied by electrochemical methods at room temperature and immersion tests in high-temperature water. The results show that the surface roughnesses of various materials are 1400 μm for 100#, 420 μm for 1000# and 24 μm for the polished sample. The greater the roughness is, the poorer the corrosion resistance (Ecorr) becomes at room temperature. In a water environment at higher temperatures, the rate of weight gain gradually increases; that is, the corrosion resistance decreases with increasing roughness, and the thickness of the oxide film also increases. On the other hand, the number of larger particles on the surface gradually decreases with decreasing roughness. Finally, the surface morphology changes from particles in the ground samples to strip-like in the polished sample in a water environment at high temperatures. Finally, in the nuclear power plant, the corrosion resistance of ENiCrFe-7 weld overlay cladding material decreases both at room temperature and at higher temperatures with increasing roughness. In addition, the oxide film is mainly composed of Cr2O3, FeCr2O4, Fe3O4, Fe and metallic Ni in high-temperature water.