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<p>Cu–Ti alloys were prepared by accumulative roll bonding-deformation aging (ARB-DA) process. The electrochemical corrosion behavior was compared with accumulative roll bonding-diffusion heat treatment and aging (ARB-DHTA) alloys, and the corrosion resistance mechanism was revealed. The results show that deeper pits exist on ARB-DHTAed Cu–Ti alloy surfaces with the corrosion time prolongation. ARB-DAed Cu–Ti alloys have relatively flat surfaces, higher film resistance and lower dimensional passivation current density. Length of the passivation interval is about twice longer than that of ARB-DHTAed alloys. Precipitates and special grain boundaries (SGBs) affect corrosion resistance. High-density dispersive nano-precipitates detach from the matrix and attach to the ARB-DAed alloy surface in the initial corrosion stage. Precipitates increase as the corrosion process proceeds, and wrap around the surface to form a dense protective film. As a result, an “enveloping effect” reduces the corrosion rate of Cl<sup>−</sup> and improves the passivation effect effectively with SGBs.</p>

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Precipitate enveloping effect and its influence on the corrosion resistance of Cu–Ti alloys prepared by accumulative roll bonding-deformation aging process

  • 期刊论文

  • 发表日期：

    2025年12月19日

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  • Yingming Tu,
  • Yizhen Ma,
  • Zhiguo Zhang,
  • Qinjin Dai,
  • Ke Cheng,
  • Xuefeng Liu

摘要

Cu–Ti alloys were prepared by accumulative roll bonding-deformation aging (ARB-DA) process. The electrochemical corrosion behavior was compared with accumulative roll bonding-diffusion heat treatment and aging (ARB-DHTA) alloys, and the corrosion resistance mechanism was revealed. The results show that deeper pits exist on ARB-DHTAed Cu–Ti alloy surfaces with the corrosion time prolongation. ARB-DAed Cu–Ti alloys have relatively flat surfaces, higher film resistance and lower dimensional passivation current density. Length of the passivation interval is about twice longer than that of ARB-DHTAed alloys. Precipitates and special grain boundaries (SGBs) affect corrosion resistance. High-density dispersive nano-precipitates detach from the matrix and attach to the ARB-DAed alloy surface in the initial corrosion stage. Precipitates increase as the corrosion process proceeds, and wrap around the surface to form a dense protective film. As a result, an “enveloping effect” reduces the corrosion rate of Cl− and improves the passivation effect effectively with SGBs.