万红霞,李婷婷,宋东东,陈长风.X80管线钢在硫酸盐还原菌作用下的腐蚀行为[J].表面技术,2020,49(9):281-290.
WAN Hong-xia,LI Ting-ting,SONG Dong-dong,CHEN Chang-feng.Effect of SRB on Corrosion Behavior of X80 Pipeline Steel[J].Surface Technology,2020,49(9):281-290 |
| X80管线钢在硫酸盐还原菌作用下的腐蚀行为 |
| Effect of SRB on Corrosion Behavior of X80 Pipeline Steel |
| 投稿时间：2019-08-27 修订日期：2020-09-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2020.09.032 |
| 中文关键词: X80管线 硫酸盐还原菌 微生物腐蚀 腐蚀行为 腐蚀产物 |
| 英文关键词:X80 pipeline SRB microbial corrosion corrosion behavior corrosion products |
| 基金项目:国家自然科学基金项目（51701055）；中国石油大学（北京）科研启动基金项目（2462018YJRC021） |
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| 中文摘要: |
| 目的 通过实验模拟硫酸盐还原菌（SRB）对X80钢的腐蚀，探究硫酸盐还原菌的腐蚀过程。方法 通过细菌培养实验，计数得到固着SRB和浮游SRB的生长曲线以及溶液中pH值的变化曲线。通过腐蚀电化学测试，研究了SRB对X80腐蚀的影响。通过浸泡实验，获得SRB对腐蚀速率的影响。采用扫描电镜和激光共聚焦显微镜对SRB腐蚀后的表面形貌和最大点蚀深度进行了分析，利用EDS和XPS对腐蚀产物的成分进行了分析。结果 在接种SRB的溶液中，X80钢表面固着的SRB比浮游的SRB多；随着培养时间增长，溶液pH增大。接种SRB环境中，X80钢阻抗和线性极化电阻均小于无菌环境中的值，有菌环境中腐蚀电流密度大于无菌环境中的值。随着浸泡时间增长，最大点蚀坑深度变深。通过EDS能谱分析发现，在含有SRB的环境中，S元素和O元素的含量较无菌环境中高，XPS结果表明，SRB环境中腐蚀产物多为Fe的硫化物。结论 固着SRB使试样表面的铁溶解为铁离子，铁离子与溶液中的硫酸根离子在SRB生命活动的作用下生成铁的硫化物，从而促进了X80钢的腐蚀。 |
| 英文摘要: |
| The work aims to explore the corrosion process of sulfate-reducing bacteria by simulating the corrosion of X80 pipeline steel under the action of sulfate-reducing bacteria. Growth curves of sessile SRB and planktonic SRB as well as the pH change curves in solution were obtained through bacterial culture experiment. The electrochemical test was carried out to study the effect of SRB on X80 corrosion. Through immersion experiment, the effect of SRB on corrosion rate was obtained. The surface morphology and the maximum pitting depth after SRB corrosion were analyzed by SEM and laser confocal microscope. The components of the corrosion products were analyzed by EDS and XPS. In the solution inoculated with SRB, there were more sessile SRB fixed on the surface of X80 steel than planktonic SRB. With the growth of culture time, the pH of solution increased. In SRB inoculated environment, the impedance and linear polarization resistance of X80 steel were lower than that of sterile environment, but the corrosion current density was higher than that of sterile environment. With the increase of immersion time, the maximum pitting depth became deeper. According to EDS energy spectrum, the content of S element and O element in the environment containing SRB was higher than that in the sterile environment. XPS results showed that the corrosion products in the environment containing SRB were mostly Fe sulfide. Sessile SRB dissolves iron on the surface of the sample into iron ions and under the action of SRB’s life activities, iron ions react with sulfate ions in the solution to form iron sulfide, thus promoting the corrosion of X80 steel. |
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