The effect of fluoride ion on crevice corrosion of Ti-6Al-3Nb-2Zr-1Mo alloy in NaCl solution

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

Corrosion Science Pub Date : 2025-09-02 DOI:10.1016/j.corsci.2025.113287

Chao Chen , Tiaobing Xiao , Yizhou Li , Zhongyu Cui , Hongzhi Cui

引用次数: 0

Abstract

This study investigates crevice corrosion behavior of Ti-6Al-3Nb-2Zr-1Mo alloy in solution with various NaF concentrations, revealing spontaneous passivation at 0–0.2 M NaF and active dissolution at 0.5 M NaF. While demonstrating superior crevice corrosion resistance in F⁻-free environments, the alloy becomes highly susceptible in F⁻-containing solutions. Crevice structure substantially lowers F⁻ critical corrosion threshold and shifts phase-dependent degradation modes: β-phase dissolution dominates in bulk solutions with 0.5 M F⁻, whereas crevice conditions preferentially attack α-phase. These effects are attributed to localized acidification, F⁻ enrichment, and oxygen depletion of crevice environment, which accelerates passive film dissolution and hinders repassivation processes, fundamentally altering the alloy corrosion dynamics inside crevice.

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氟离子对Ti-6Al-3Nb-2Zr-1Mo合金在NaCl溶液中缝隙腐蚀的影响

本文研究了Ti-6Al-3Nb-2Zr-1Mo合金在不同NaF浓度溶液中的缝隙腐蚀行为，发现在0-0.2 M NaF时自发钝化，在0.5 M NaF时主动溶解。虽然在没有F -⁻的环境中表现出优异的裂缝耐腐蚀性，但在含有F -⁻的溶液中，这种合金变得非常敏感。裂缝结构大大降低了F -临界腐蚀阈值，改变了相依赖的降解模式：β相溶解在体积溶液中占主导地位，浓度为0.5 M F -毒血症，而裂缝条件优先攻击α相。这些影响归因于局部酸化、F -毒化和缝隙环境的缺氧，这加速了钝化膜的溶解，阻碍了再钝化过程，从根本上改变了缝隙内合金的腐蚀动力学。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.