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<p>This research focused on the anti-corrosion ability of B30 alloys produced by different cooling rates in 3.5&#xa0;wt.% NaCl medium. Results demonstrate that the anodic region of the polarization curve presents obvious activation dissolution characteristic, and a positive correlation exists between cooling rate and corrosion resistance. Water-cooled sample exhibits excellent resistance capacity against corrosion, followed by the air-cooled and furnace-cooled alloys, reflected by the variation of corrosion current density (<i>i</i><sub>corr</sub>), corrosion rate, and charge transfer resistance (<i>R</i><sub>ct</sub>). The difference in corrosion resistance is highly linked to grain size, twin density, and the protectiveness of corrosion product film. In comparison with other B30 alloys, the furnace-cooled specimen with more twin quantity displays a severe corrosion status. Moreover, the relatively dense and stable corrosion product film is formed on the alloy treated with water cooling method, which effectively blocks Cl<sup>−</sup> penetration. In contrast, the surface film on furnace-cooled sample is defective, failing to prevent the substrate corrosion remarkably.</p>

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Research on the Anti-Corrosion Performance of Copper-Nickel Alloy with Different Microstructures in Stimulated Ocean Medium

  • 期刊论文

  • 发表日期：

    2025年11月20日

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  • J. T. Zhang,
  • J. L. Dai,
  • K. L. Lou,
  • M. Zhu,
  • Y. F. Yuan

摘要

This research focused on the anti-corrosion ability of B30 alloys produced by different cooling rates in 3.5 wt.% NaCl medium. Results demonstrate that the anodic region of the polarization curve presents obvious activation dissolution characteristic, and a positive correlation exists between cooling rate and corrosion resistance. Water-cooled sample exhibits excellent resistance capacity against corrosion, followed by the air-cooled and furnace-cooled alloys, reflected by the variation of corrosion current density (icorr), corrosion rate, and charge transfer resistance (Rct). The difference in corrosion resistance is highly linked to grain size, twin density, and the protectiveness of corrosion product film. In comparison with other B30 alloys, the furnace-cooled specimen with more twin quantity displays a severe corrosion status. Moreover, the relatively dense and stable corrosion product film is formed on the alloy treated with water cooling method, which effectively blocks Cl− penetration. In contrast, the surface film on furnace-cooled sample is defective, failing to prevent the substrate corrosion remarkably.