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<p>A systematic study on the anti-corrosion performance of Ti-6Al-4&#xa0;V (TC4) alloy in simulated ocean environment under the combined influence of F<sup>−</sup> and alternating current (AC) was conducted. The results reflect that the increasing F<sup>−</sup> concentration and alternating current density deteriorates the passivation capability and pitting resistance of the alloy, as verified by increased i<sub>p</sub>, quantity of metastable pitting and the corrosion rate. The imposed AC perturbs the generation and stabilization of passivation film, as proved by the emergence of transition region as well as a sharp increase in donor density. As F<sup>−</sup> concentration rises, the decreased <i>R</i><sub>f</sub>, increased <i>Q</i><sub>f</sub> and holes within the passive film indicate a decrease in the integrity and compactness of the film, resulting in the production of many shallow corroded zones. Under the synergistic impact of AC and F<sup>−</sup>, the passivation film thins significantly, with large-sized pores forming in its interior, suggesting a substantial reduction in the protection of the film. Corrosion pits are driven by the overall dissolution of Ti, Al and V elements.</p>

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Degradation of Anti-Corrosion Performance of TC4 Alloy under the Synergistic Impacts of F− Ion and Alternating Current in Simulated Seawater

  • 期刊论文

  • 发表日期：

    2025年12月15日

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  • K. L. Lou,
  • M. Zhu,
  • Y. F. Yuan,
  • L. Nie

摘要

A systematic study on the anti-corrosion performance of Ti-6Al-4 V (TC4) alloy in simulated ocean environment under the combined influence of F− and alternating current (AC) was conducted. The results reflect that the increasing F− concentration and alternating current density deteriorates the passivation capability and pitting resistance of the alloy, as verified by increased ip, quantity of metastable pitting and the corrosion rate. The imposed AC perturbs the generation and stabilization of passivation film, as proved by the emergence of transition region as well as a sharp increase in donor density. As F− concentration rises, the decreased Rf, increased Qf and holes within the passive film indicate a decrease in the integrity and compactness of the film, resulting in the production of many shallow corroded zones. Under the synergistic impact of AC and F−, the passivation film thins significantly, with large-sized pores forming in its interior, suggesting a substantial reduction in the protection of the film. Corrosion pits are driven by the overall dissolution of Ti, Al and V elements.