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X52钢在靖西一线模拟土壤环境中的电化学腐蚀行为

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  • 1. 陕西省天然气股份有限公司; 2. 中国石油集团工程材料研究院有限公司石油管材及装备材料服役行为与结构安全国家重点实验室
黄呈帅(1980-),工学博士,高级工程师,主要研究方向为油气管道管体分析、管道焊接特性研究、工程建设,电话:029-86156019,E-mail:24840430@qq.com

收稿日期: 2021-10-26

  修回日期: 2021-11-24

  录用日期: 2021-12-27

  网络出版日期: 2023-12-28

基金资助

陕西省人民政府国有资产监督管理委员会2018年度省级国有资本经营预算科技创新专项资金项目(2018gykc-013)资助

Electrochemical Corrosion Behavior of X52 Steel in Simulated Jingxi First Line Soil Environment

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  • 1. Shaanxi Gas Group Co., Ltd., Xi’an 710016, China;2. State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, Tubular Goods Research Institute, CNPC, Xi’an 710077, China

Received date: 2021-10-26

  Revised date: 2021-11-24

  Accepted date: 2021-12-27

  Online published: 2023-12-28

摘要

为分析X52钢在西部地区土壤环境中的腐蚀机制,以安塞土壤环境为基础,采用动电位极化技术、电化学阻抗技术和扫描电镜研究了土壤含水量和离子浓度对X52钢腐蚀过程的影响规律。结果表明:X52钢在20%含水量安塞土壤介质中的电荷转移电阻远大于在高含水量土壤介质中的;腐蚀速率随土壤中含水量的增加呈现先增加后降低的趋势。20%含水量安塞土壤介质中X52钢表面存在少量腐蚀坑,增加土壤含水量导致腐蚀坑数量显著增加,同时发现腐蚀产物颗粒底部呈现溃疡状腐蚀形貌。NS4土壤模拟溶液中的阴离子浓度大于安塞土壤模拟溶液的,导致X52钢在NS4模拟溶液中的耐腐蚀性较差;EIS结果表明溶液中阴离子浓度的增加降低了溶液电阻和电荷转移电阻,促使电极反应从活化控制转变为浓度扩散控制。

本文引用格式

黄呈帅, 郭永超, 罗志鹏, 王俊 . X52钢在靖西一线模拟土壤环境中的电化学腐蚀行为[J]. 材料保护, 2022 , 55(4) : 54 -62 . DOI: 10.16577/j.issn.1001-1560.2022.0095

Abstract

For analyzing the corrosion mechanism of X52 pipeline steel in the soil enviroment of western China, based on the real soil environment in Ansai area, the potentiodynamic polarization technique, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM) were used to reveal the influence law of soil water content and ion concentration on the corrosion process of X52 steel. Results showed that the charge-transfer resistance of X52 steel in 20% water content soil medium was far greater than that in high water content soil medium. The corrosion rate increased firstly and then decreased with the increase of soil water content. In addition, few corrosion pits were found on the surface of X52 steel in the soil medium with 20% water content. With the increase of water content, the number of corrosion pits increased greatly, and the bottom of corrosion product particles showed ulcerative corrosion morphology. Moreover, the anion concentration in NS4 soil simulation solution was higher than that of Ansai soil simulation solution, resulting in worse corrosion resistance of X52 steel in NS4 simulation solution. EIS results showed that increasing the concentration of anion reduced the solution resistance and charge transfer resistance, which promoted the transition of the electrode reaction from activation-controlled reaction to the concentration diffusion-controlled reaction.
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