密相CO2环境中A106钢腐蚀行为研究

余直霞, 张国庆, 李妍, 万明奇, 王智, 王岳松, 金正宇, 柳海宪, 陈炅明, 刘宏伟

doi:10.16577/j.issn.1001-1560.2025.0098

材料保护 >

2025 , Vol. 58 >Issue 6: 72 - 82

DOI: https://doi.org/10.16577/j.issn.1001-1560.2025.0098

研究论文

密相CO₂环境中A106钢腐蚀行为研究

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1海洋石油工程股份有限公司； 2中山大学化学工程与技术学院

刘宏伟(1988－),副教授,博士,主要从事海洋腐蚀与防护、先进功能材料研究,电话:0756－3668318,E-mail: liuhw35＠mail.sysu.edu.cn

收稿日期: 2024-11-01

修回日期: 2024-12-05

录用日期: 2024-12-06

网络出版日期: 2025-07-09

基金资助

国家自然科学基金(52271083)；广东省自然科学基金(2023A1515012146)

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Study on Corrosion Behavior of A106 Carbon Steel in Dense-Phase CO₂ Environment

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(1.Offshore Oil Engineering Co., Ltd., Tianjin 300461, China；2.School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China)

LIU Hongwei (1988－), Associate Professor, Ph.D., Research Focus: Marine Corrosion and Protection, Advanced Materials, Tel.: 0756－3668318, E-mail: liuhw35＠mail.sysu.edu.cn

Received date: 2024-11-01

Revised date: 2024-12-05

Accepted date: 2024-12-06

Online published: 2025-07-09

Supported by

National Natural Science Foundation of China (52271083)； Guangdong Basic and Applied Basic Research Foundation(2023A1515012146)

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摘要

超临界-密相CO2环境中金属材料的腐蚀问题是碳捕集、利用与封存(Carbon Capture， Utilization and Storage， CCUS)技术的关键因素。在含有强腐蚀性离子的微水环境中A106 钢的腐蚀行为研究还有待深入。本工作聚焦于密相(液相)CO2环境中A106 钢的腐蚀行为研究，通过高压釜模拟密相CO2环境，通过失重、扫描电镜、X射线衍射仪以及超景深3D 显微镜等探究了微含水量(200、1 000、1 500、2 000、2 500、3 000 μL/L)对A106 钢腐蚀行为的影响。结果表明:在密相CO2环境中，A106 钢在含水量为3 000 μL/L 时的均匀腐蚀速率最大，为0.086 7 mm/a。试样表面形成了不均匀的碳酸亚铁腐蚀产物膜，为局部腐蚀的形成创造了良好的条件，最大点蚀速率达到0.548 mm/a。水含量是影响密相CO2环境中金属材料腐蚀的关键，在25 ℃、10 MPa 条件下，水和CO2互溶，在微水环境中，水主要以溶解态的形式存在于液态CO2中，少量的游离水在试样表面富集，形成不连续液膜或者液滴，导致A106 钢的腐蚀加速。

关键词： 碳捕集、利用与封存; 密相CO₂腐蚀; A106 钢; CO₂腐蚀; 点蚀

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余直霞, 张国庆, 李妍, 万明奇, 王智, 王岳松, 金正宇, 柳海宪, 陈炅明, 刘宏伟 . 密相CO₂环境中A106钢腐蚀行为研究[J]. 材料保护, 2025 , 58(6) : 72 -82 . DOI: 10.16577/j.issn.1001-1560.2025.0098

Abstract

The corrosion problem of metal materials in supercritical-dense phase CO2 environment is a key factor influencing Carbon Capture,Utilization and Storage (CCUS) technology.However, the corrosion behavior in the micro-water environment with strong corrosive ions is still in need of further investigation.This study focused on investigating the corrosion behavior of A106 steel in dense-phase (liquid) CO2 environments.A high-pressure autoclave was employed to simulate the dense-phase CO2 conditions, while weight loss measurements, scanning electron microscopy (SEM), X-ray diffraction (XRD) and super-depth-of-field 3D microscopy were utilized to systematically examine the effects of micro-water content (200, 1 000, 1 500, 2 000, 2 500 and 3 000 μL/L) on the corrosion behavior of A106 steel.Results showed that in dense-phase CO2 environments, A106 steel exhibited its maximum uniform corrosion rate of 0.086 7 mm/a at a water content of 3 000 μL/L.An uneven ferrous carbonate corrosion product film formed on the specimen surface, creating favorable conditions for localized corrosion development, with the maximum pitting rate reaching 0.548 mm/a.Furthermore, water content was the critical factor affecting metal corrosion in dense-phase CO2 environments, and under the conditions of 25 ℃and 10 MPa, water and CO2 become mutually soluble.In the micro-water environment, water primarily existed in a dissolved state within the liquid CO2 phase,and trace amounts of free water accumulated on the specimen surface, forming discontinuous liquid films or droplets that accelerated the corrosion of A106 steel.

Key words： CCUS; dense-phase CO₂ corrosion; A106 steel; CO₂ corrosion; pitting corrosion

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