湿气管道积液区X70钢CO2 局部腐蚀行为研究

doi:10.11902/1005.4537.2022.296

中国腐蚀与防护学报

2023, Vol. 43

Issue (4): 837-846 CSTR: 32134.14.1005.4537.2022.296 DOI: 10.11902/1005.4537.2022.296

曹楚南科教基金优秀论文专栏

本期目录 | 过刊浏览

湿气管道积液区X70钢CO₂ 局部腐蚀行为研究

李强¹(

), 路程², 唐颖浩³, 唐建峰², 刘炳成¹

^1.青岛科技大学气候变迁与能源可持续发展研究院青岛 266061
^2.中国石油大学 (华东) 储运与建筑工程学院青岛 266580
^3.中国石油天然气管道工程有限公司廊坊 065099

Localized CO₂ Corrosion of X70 Steel in Water Accumulation Zone of Wet Gas Pipelines

LI Qiang¹(

), LU Cheng², TANG Yinghao³, TANG Jianfeng², LIU Bingcheng¹

^1.Institute of Climate and Energy Sustainable Development, Qingdao University of Science and Technology, Qingdao 266061, China
^2.College of Pipeline and Civil Engineering, University of China Petroleum (East China), Qingdao 266580, China
^3.China Petroleum Pipeline Engineering Corporation, Langfang 065099, China

全文: PDF(12151 KB) HTML

摘要:

自行设计搭建了可模拟开展管道积液区CO₂局部腐蚀测试的实验装置，借助丝束电极测试系统，获取倾斜管道不同部位的腐蚀电位与耦合电流，分析探讨了管线积液区的局部腐蚀行为机制。结果表明：在不同的管道结构、气体流动参数条件下，积液区管道内均呈现出局部腐蚀特征，并随着时间延长向局部区域集中。在本文的研究条件下，气体流速为2 m/s，管道倾角为30°时，局部腐蚀最为严重。液膜厚度的不均匀分布程度、波浪流经的频次大小、腐蚀产物膜的生成情况等共同影响局部腐蚀过程，其中波浪频次和腐蚀产物膜对腐蚀的影响最为显著。

关键词 ： CO₂局部腐蚀, 积液区, 非稳态流动, 液膜, X70钢, 腐蚀产物

Abstract：

The free corrosion potential and galvanic corrosion current of different spots of an inclined pipeline were assessed via a home-made device, aiming to simulate the CO₂ induced localized-corrosion emerged at the area with standing water of an inclined pipeline of X70 steel for transporting wet gas, with an electrode composed with a bundle of isolated wires of matrix-like distribution as measuring electrodes. So that to illustrate the relevant localized corrosion mechanism. The results showed that localized corrosion happens for different pipeline structure by different gas flow conditions. What is more, the localized corrosion became more concentrated when the exposure time was elongated. The most severe localized corrosion was seen when the gas flow velocity was 2 m/s and the pipeline had an inclined angle of 30°. Amongst the three factors, including the extent of non-uniformity of water film thickness, frequency of waves arisen by the high velocity gas flow and the formation of corrosion film, that affected the corrosion process, wave frequency and corrosion film had the most influential effect.

Key words： CO₂ localized corrosion water accumulation zone non-steady flow water film X70 steel corrosion product

收稿日期: 2022-09-24 32134.14.1005.4537.2022.296

ZTFLH:

TG174

基金资助:山东省自然科学基金(ZR2019BEE040);中央高校基本科研费用专项资金(18CX02001A)

通讯作者: 李强，E-mail: qiangli@qust.edu.cn，研究方向为天然气管道的腐蚀与防护

Corresponding author: LI Qiang, E-mail: qiangli@qust.edu.cn

作者简介: 李强，男，1988年生，博士，讲师，中国石油大学 (华东) 硕士学位，加拿大卡尔加里大学机械与制造工程专业博士学位，师从欧盟科学院院士Frank Cheng教授，现青岛科技大学气候变迁与能源可持续发展研究院开展博士后研究工作，研究方向为管道腐蚀与防护、腐蚀建模及预测。近年来，主持山东省自然科学基金1 项，骨干参与国家自然科学基金面上基金2 项，主持、参与各类企事业单位项目10 余项；以第一作者/通讯作者发表SCI、EI收录研究论文10 篇。2022年获得曹楚南科教基金优秀论文奖。

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引用本文:

李强, 路程, 唐颖浩, 唐建峰, 刘炳成. 湿气管道积液区X70钢CO₂ 局部腐蚀行为研究[J]. 中国腐蚀与防护学报, 2023, 43(4): 837-846.
LI Qiang, LU Cheng, TANG Yinghao, TANG Jianfeng, LIU Bingcheng. Localized CO₂ Corrosion of X70 Steel in Water Accumulation Zone of Wet Gas Pipelines. Journal of Chinese Society for Corrosion and protection, 2023, 43(4): 837-846.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.296 或 https://www.jcscp.org/CN/Y2023/V43/I4/837

图1 模拟积液区CO2局部腐蚀试验装置示意图

图2 实验丝束电极示意图

图3 不同倾角下的耦合电流测试结果

图4 不同倾角管内积液流动状态

图5 不同气体流速下的耦合电流测试结果

图6 不同气体流速管内积液流动状态

图7 不同腐蚀时间条件下耦合电流分布结果

图8 典型位置处电极丝的EIS及其等效电路图

表1 各不同位置处电极丝的EIS拟合结果

图9 丝束电极C在不同腐蚀时间后的腐蚀形貌

图10 腐蚀168 h后不同位置处电极丝腐蚀形貌

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