湿气管道积液区X70钢CO_(2)局部腐蚀行为研究  

Localized CO_(2)Corrosion of X70 Steel in Water Accumulation Zone of Wet Gas Pipelines

作　　者：李强[1] 路程 唐颖浩[3] 唐建峰[2] 刘炳成[1] LI Qiang;LU Cheng;TANG Yinghao;TANG Jianfeng;LIU Bingcheng(Institute of Climate and Energy Sustainable Development,Qingdao University of Science and Technology,Qingdao 266061,China;College of Pipeline and Civil Engineering,University of China Petroleum(East China),Qingdao 266580,China;China Petroleum Pipeline Engineering Corporation,Langfang 065099,China)

机构地区：[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

出　　处：《中国腐蚀与防护学报》2023年第4期837-846,共10页Journal of Chinese Society For Corrosion and Protection

基　　金：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)。

摘　　要：自行设计搭建了可模拟开展管道积液区CO_(2)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。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 CO_(2)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.

关 键 词：CO_(2)局部腐蚀 积液区 非稳态流动 液膜 X70钢 腐蚀产物 

分 类 号：TG174[金属学及工艺—金属表面处理]