X80管线钢应力腐蚀裂纹腐蚀机理的原位微电化学综合研究

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

Corrosion Science Pub Date : 2025-10-14 DOI:10.1016/j.corsci.2025.113415

Tian-Yu Zhao , Jian Wang , Qiu-Yu Huang , Yu-Hua Xiao , Hao Li , Qin-Hao Zhang , Pan Liu , Lian-Kui Wu , Fa-He Cao

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引用次数: 0

摘要

由于缺乏裂纹尖端的原位证据，对X80钢在服役相关弹性应力作用下的应力腐蚀开裂（SCC）的认识受到限制。利用SECM SVET和MECT，我们证明了200 MPa弹性应力是一个机械开关。它触发了从强烈的阴极碱化到局部阳极溶解的电化学转化，创造了一个稳定的“小阳极-大阴极”电池。这将裂纹尖端的腐蚀电流放大了2.5倍以上，并将活性阳极扩展到距离尖端至少200 μm的半径处，从而形成了非平衡酸性微环境。我们的研究结果为重新定义SCC机制和改进预测模型提供了定量的、可解决裂纹尖端问题的数据。

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An integrated in-situ micro-electrochemical investigation on the corrosion mechanism of stress corrosion crack in X80 pipeline steel

Understanding stress corrosion cracking (SCC) of X80 steel under service-relevant elastic stress is limited by the lack of crack-tip, in-situ evidence. Using SECM SVET and MECT, we demonstrate that 200 MPa elastic stress is a mechanistic switch. It triggers an electrochemical inversion from intense cathodic alkalization to localized anodic dissolution, creating a stable "small anode-large cathode" cell. This amplifies the crack-tip corrosion current more than 2.5 times and expands the active anode to at least 200 μm radius from the tip, creating a non-equilibrium acidic microenvironment. Our findings provide quantitative, crack-tip-resolved data essential for redefining SCC mechanisms and improving predictive models.

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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.