超临界CO2环境下X65钢焊缝不同组织区的腐蚀敏感性

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

Corrosion Science Pub Date : 2025-09-26 DOI:10.1016/j.corsci.2025.113359

Xinxin Fan , Guangyu Liu , Cailin Wang , Qihui Hu , Yuxing Li

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引用次数: 0

摘要

针对目前在超临界CO2管道条件下焊接接头腐蚀行为研究方面存在的重大空白，本研究介绍了一种基于电化学噪声的现场监测系统。利用综合了EBSD、SEM和3D轮廓测量等多种表征技术的超临界CO2腐蚀测试平台，对X65钢焊接接头进行了全面的研究，以评估水分含量和微观组织特征对腐蚀敏感性的影响。结果表明：在不同湿度条件下，热影响区（HAZ）的均匀腐蚀速率最高（0.0946 mm/y），母材、焊缝区和HAZ的局部腐蚀速率最高（1.946 mm/y）；EN分析显示，在所有试样中均存在稳定和亚稳点蚀。值得注意的是，HAZ的电化学电位噪声（EPN）幅值最高（0.24 V），电化学电流噪声（ECN）幅值最高（1.08 × 10−8 A），波动周期最短（413 s），表明HAZ具有明显的腐蚀敏感性。显微组织分析进一步表明，HAZ的超细晶组织具有最高的晶界密度，KAM值达到1.8°。晶粒细化、晶界密度升高和残余应力的综合作用是影响热影响区腐蚀机制的主要因素。

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Corrosion susceptibility of different microstructural zones in X65 steel weld joints under supercritical CO2 environment

In light of the significant research gap concerning the corrosion behavior of welded joints under supercritical CO₂ pipeline conditions, this study introduces an in-situ monitoring system based on electrochemical noise. A comprehensive investigation was carried out using a supercritical CO₂ corrosion testing platform integrated with multiple characterization techniques, including EBSD, SEM, and 3D profilometry, to evaluate the influence of moisture content and microstructural features on the corrosion susceptibility of X65 steel welded joints. The results indicate that under varying moisture conditions in supercritical CO₂, the heat-affected zone (HAZ) exhibited the highest uniform corrosion rate (0.0946 mm/y) and localized corrosion rate (1.946 mm/y) among the base metal, weld zone, and HAZ. EN analysis revealed the coexistence of both stable and metastable pitting in all specimens. Notably, the HAZ showed the highest electrochemical potential noise (EPN) amplitude (0.24 V) and electrochemical current noise (ECN) amplitude (1.08 × 10⁻⁸ A), along with the shortest fluctuation period (413 s), confirming its pronounced corrosion susceptibility. Microstructural analysis further revealed that the ultrafine-grained structure of the HAZ possessed the highest grain boundary density, with KAM values reaching 1.8°. The combined effects of grain refinement, elevated grain boundary density, and residual stress were identified as the primary contributors to the corrosion mechanisms in the HAZ.

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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.