Volume 39 Issue 2
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ZHANG Hengkun, LUO Xianfu, SHEN Pengyang, ZHANG Wenli, ZHA Xiaoqin. Effect of Sensitization Treatment on Intergranular Corrosion Property of 825 Alloy[J]. Development and Application of Materials, 2024, 39(2): 50-56.
Citation: ZHANG Hengkun, LUO Xianfu, SHEN Pengyang, ZHANG Wenli, ZHA Xiaoqin. Effect of Sensitization Treatment on Intergranular Corrosion Property of 825 Alloy[J]. Development and Application of Materials, 2024, 39(2): 50-56.
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Effect of Sensitization Treatment on Intergranular Corrosion Property of 825 Alloy

  • 1. Luoyang Ship Material Research Institute, Luoyang 471023, China;

  • 2. Henan Key Laboratory of Technology and Application of Structural Materials for Ships and Marine Equipments, Luoyang 471023, China

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  • Received Date: December 05, 2022
  • Available Online: May 08, 2024
    Graphical Abstract
    • Abstract
  • The influence of sensitisation treatment on the intergranular corrosion properties of 825 alloy is investigated by 50 % sulphuric acid-iron sulphate intergranular corrosion test and polarisation curve analysis, and the causes are observed and analysed by metallography (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the corrosion rate and corrosion current density of the sensitized specimen of 825 alloy held at 750 ℃ for 1 h are 57 % and 48 % of those of the solid solution specimen, respectively. There are no precipitate precipitation at the grain boundaries of the sensitized and solid solution specimens, and no chromium-poor zones around the grain boundary, therefore, the material has no intergranular corrosion susceptibility. However, there are differences in potentials between the precipitated TiN and Ti(C,N) particles within the grains and the substrate, which can easily lead to the occurrence of pitting corrosion. After sensitisation treatment at 750 ℃ for 1 h, the grain size of the 825 alloy is uniform, the distribution of TiN and Ti(C,N) particles precipitated is uniform, and the corrosion resistance of the material is enchanced.
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    • References (15)
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