X65钢焊接接头在超临界CO2相及富H2O相中的腐蚀机理研究

doi:10.11949/0438-1157.20241422

摘要/Abstract

摘要：

碳捕集、利用与封存（CCUS）技术对于实现国家双碳目标和减缓气候变化具有至关重要的作用。捕集得到的含H₂O的CO₂会对管输体系造成严重的腐蚀危害。本研究从输送体系可能的耐腐蚀薄弱环节焊接接头入手，研究X65管线钢焊接接头在富H₂O相以及富CO₂环境中，各区域的腐蚀行为与机理。结果表明，在富CO₂相中，焊接接头各区域的均匀腐蚀速率均较低，这可能与生成了FeCO₃产物膜有关；而在富H₂O相中，焊接接头各区域均匀腐蚀速率显著升高，各区域均匀腐蚀差异并不明显，在热影响区出现了更为明显的点蚀深坑，且表面粗糙度较高。

关键词: CCUS, 焊接接头, 膜, 超临界二氧化碳, 腐蚀

Abstract:

Carbon capture, utilization and storage (CCUS) technology plays a critical role in achieving carbon neutrality goals and mitigating climate change. The captured CO₂ containing H₂O will cause serious corrosion damage to the pipeline system. This study focused on the potential corrosion-prone component of the transportation system-welded joints and investigated the corrosion behavior and mechanisms of X65 pipeline steel welded joints in water-rich and CO₂-rich environments. The results revealed that in CO₂-rich environments, the uniform corrosion rates in different regions of the welded joints were relatively low, likely due to the formation of FeCO₃ product films. In contrast, in water-rich environments, the uniform corrosion rates increased significantly, with no notable differences between different regions. The heat-affected zone exhibited pronounced pitting corrosion with deeper pits and higher surface roughness.

Key words: CCUS, welded joint, film, supercritical carbon dioxide, corrosion

中图分类号:

TE 832

丁宏鑫, 干文翔, 赵雍洋, 贾润泽, 康子祺, 赵玉隆, 向勇. X65钢焊接接头在超临界CO₂相及富H₂O相中的腐蚀机理研究[J]. 化工学报, 2025, 76(7): 3426-3435.

Hongxin DING, Wenxiang GAN, Yongyang ZHAO, Runze JIA, Ziqi KANG, Yulong ZHAO, Yong XIANG. Corrosion mechanisms of X65 steel welded joints in supercritical CO₂ and H₂O-rich phases[J]. CIESC Journal, 2025, 76(7): 3426-3435.

图/表 13

表1 X65管线钢元素成分

Table 1 Elemental composition of X65 pipeline steel

元素	含量/%（质量分数）
C	0.12
Ni	0.07
Mo	0.17
Mn	1.27
Cr	0.11
V	0.057
Nb	0.05
Si	0.18
Cu	0.12
Sn	0.008
Al	0.022
B	0.0005
Ti	0.001
S	0.002
Fe	余量

图1 高温高压反应釜实验装置

Fig.1 Schematic diagram of the high-temperature and high-pressure autoclave

图2 X65钢焊接接头金相组织结构

Fig.2 Metallographic structure of welded joints of X65 steel

图3 X65钢焊接接头各区域在富H2O相与富CO2相中72 h的腐蚀速率

Fig.3 Corrosion rate of different regions of X65 steel welded joints in water-rich and CO2-rich environments for 72 h

图4 X65管线钢焊接接头在不同工况下的形貌

Fig.4 Corrosion morphology of X65 pipeline steel welded joints under different environmental conditions

表2 管线钢焊接接头EDS元素分析

Table 2 EDS element analysis of pipeline steel welded joints

选取条件	质量分数/%
选取条件	C	O	Fe
A	4.50	2.69	92.81
B	7.19	3.91	88.90
C	8.27	4.70	87.03
D	9.86	40.09	50.05
E	11.37	39.86	48.77
F	10.33	41.00	48.67

图5 X65管线钢焊接接头在不同工况下的截面形貌

Fig.5 The cross-section morphology of X65 pipeline steel welded joints under different working conditions

图6 X65管线钢焊接接头富H2O相环境中截面EDS元素分析面扫

Fig.6 EDS element analysis surface scanning of X65 pipeline steel welded joints in water-rich phase environment

图7 X65管线钢焊接接头富CO2相环境中截面EDS元素分析面扫

Fig.7 EDS element analysis surface scanning of X65 pipeline steel welded joints in CO2-rich phase environment

图8 X65管线钢焊接接头在不同工况下的3D形貌图

Fig.8 3D morphology of X65 pipeline steel welded joints under different working conditions

图9 X65管线钢焊接接头在不同工况下的最大点蚀速率及最大点蚀深度

Fig.9 The maximum pitting rate and maximum pitting depth of X65 pipeline steel welded joints under different working conditions

表3 不同工况下表面粗糙度

Table 3 Surface roughness under different working conditions

工况	表面粗糙度/μm
a	1.276
b	9.462
c	1.986
d	1.178
e	2.289
f	2.072

图10 X65管线钢焊接接头在不同工况下XRD分析

Fig.10 XRD analysis of X65 pipeline steel welded joints under different working conditions

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X65钢焊接接头在超临界CO₂相及富H₂O相中的腐蚀机理研究

Corrosion mechanisms of X65 steel welded joints in supercritical CO₂ and H₂O-rich phases

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