Ti-6Ta和纯钛的相依赖腐蚀逆转：硝酸蒸汽/液体环境中钽调节的钝化膜动力学

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-10-13 DOI:10.1016/j.corsci.2025.113413

Qiqian Chen , Chenzhi Xing , Aili Ma , Yue Zheng , Jiawei Qu , Xin Sun , Wenhao Li , Lianmin Zhang , Chuan Wang , Yugui Zheng

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引用次数: 0

摘要

该研究表明，在热6 M HNO₃的气相和液相中，Ti-6Ta和纯钛之间的最佳耐蚀性的相偏好发生了显著的逆转。Ti-6Ta在液相中表现出比气相更强的耐蚀性和再钝化能力，而纯钛在气相中表现出比液相更强的性能。这种反转行为可归因于被动膜的相依赖性组成。x射线光电子能谱分析显示，与气相膜（10.9 % Ta₂O₅，29.7 % TiO₂）相比，Ti-6Ta上的液相被动膜具有显着更高的保护性氧化物含量（12 % Ta₂O₅，37.3 % TiO₂）。相比之下，纯钛的液相膜保留了较低的保护tio_2含量（46.4 %），而其气相膜（54.9 %）。第一性原理计算表明，钽通过提高表面功函数、增加氧空位形成能和促进具有相依赖成分的致密Ta₂O₅-TiO₂复合钝化膜来增强耐腐蚀性。这些发现为核后处理设备的材料选择提供了理论指导，表明Ti-6Ta用于液体浸没组件，纯钛用于蒸汽主导区域，以提高多相环境中的耐腐蚀性和成本效益。

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Phase-dependent corrosion reversal in Ti-6Ta and pure titanium: Tantalum-regulated passive film dynamics in nitric acid vapor/liquid environments

This study demonstrates a significant reversal in the phase-preference for optimal corrosion resistance between Ti-6Ta and pure titanium in the vapor and liquid phases of hot 6 M HNO₃. Ti-6Ta exhibits superior corrosion resistance and repassivation ability in the liquid phase compared to the vapor phase, whereas pure titanium shows enhanced performance in the vapor phase compared to the liquid phase. This reversal behavior can be attributed to the phase-dependent composition of the passive films. X-ray photoelectron spectroscopy analysis reveals that the liquid-phase passive film on Ti-6Ta has a significantly higher content of protective oxides (12 % Ta₂O₅, 37.3 % TiO₂) compared to the vapor-phase film (10.9 % Ta₂O₅, 29.7 % TiO₂). In contrast, the liquid-phase film on pure titanium retains a lower protective TiO₂ content (46.4 %) than that in its vapor-phase film (54.9 %). First-principles calculations indicate that tantalum enhances corrosion resistance by elevating surface work function, increasing oxygen vacancy formation energy, and promoting dense Ta₂O₅-TiO₂ composite passive films with phase-dependent composition. These findings provide theoretical guidance for material selection in nuclear reprocessing equipment, suggesting Ti-6Ta for liquid-immersed components and pure titanium for vapor-dominant zones to enhance corrosion resistance and cost-effectiveness in multiphase environments.

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.