X70管线钢在大庆土壤环境中微生物腐蚀行为研究

doi:10.11902/1005.4537.2019.030

中国腐蚀与防护学报

2020, Vol. 40

Issue (2): 175-181 DOI: 10.11902/1005.4537.2019.030

研究报告

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X70管线钢在大庆土壤环境中微生物腐蚀行为研究

陈旭¹, 李帅兵¹, 郑忠硕¹, 肖继博², 明男希¹, 何川¹(

)

1 辽宁石油化工大学石油天然气工程学院抚顺 113001
2 中国石油化工股份有限公司北京燕山分公司北京 102500

Microbial Corrosion Behavior of X70 Pipeline Steel in an Artificial Solution for Simulation of Soil Corrosivityat Daqing Area

CHEN Xu¹, LI Shuaibing¹, ZHENG Zhongshuo¹, XIAO Jibo², MING Nanxi¹, HE Chuan¹(

)

1 School of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China
2 SINOPEC Beijing Yanshan Petrochemical Co. , Ltd, Beijing 102500, China

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摘要:

采用极化曲线、电化学阻抗谱技术和SEM、EDS、XRD分析方法研究了X70管线钢在含硫酸盐还原菌 (SRB) 的大庆土壤模拟溶液中的微生物腐蚀行为。结果表明，SRB在大庆土壤环境模拟溶液中生长周期分为对数生长期、衰减期和死亡期3个阶段。SRB的新陈代谢对大庆土壤环境产生显著影响：pH值在SRB生长的前2 d降低，然后呈逐渐上升趋势。氧化还原电位在SRB对数生长期降低，在衰减期和死亡期呈增加趋势。溶液电导率在SRB的对数生长期时增加，在衰减期和死亡期呈整体减小趋势。在SRB对数生长期，游离的SRB利用其新陈代谢产物H将硫酸盐还原成硫化物，促进了点蚀的发生；在SRB衰减期，腐蚀产物成团簇状，膜层致密，减缓腐蚀；在SRB死亡期，生物膜脱落，腐蚀产物膜有明显裂纹出现，形成微观腐蚀电池，导致X70管线钢的腐蚀加剧。X70管线钢在SRB的大庆土壤中腐蚀产物为FeS和Fe₃O₄。

关键词 ： X70管线钢, 大庆土壤, 硫酸盐还原菌腐蚀, 生长周期, 环境参数

Abstract：

The influence of sulfate-reducing bacteria (SRB) on the corrosion behavior of X70 pipeline steel in an artificial solution for simulation of the corrosivity of soil at Daqing area was studied by polarization curves, electrochemical impedance spectroscopy and SEM, EDS and XRD methods. The results showed that the growth cycle of SRB in the simulated solution could be differentiated as three phases: logarithmic growth phase, decay phase and death phase. SRB metabolism had significant effect on the corrosivity of the simulated solution. The pH value decreased in the first 2 d of SRB growth and then increased. Redox potential, E_h, decreased in the logarithmic growth phase, and increased in the decay and death phases. Conductivity of the solution increased in the logarithmic growth phase and decreased in the decay phase and death phases. During SRB logarithmic growth phase, the free SRB reduced sulfate into sulfide through its metabolic product H to promote the pitting corrosion of X70 steel. During the decay phase of SRB, the corrosion products formed as clusters-like, while the film was dense, which slowed down the corrosion. During the death of SRB, the biofilm dropped off and obvious cracks appeared, thereby microscopic corrosion cell formed, leading to intensified corrosion of X70 pipeline steel. Corrosion products of X70 pipeline steel in the simulated solution with SRB were mainly FeS and Fe₃O₄.

Key words： X70 pipeline steel daqing soil sulfate-reducing bacteria corrosion growth cycle environmental parameter

收稿日期: 2019-03-13

ZTFLH:

TG174.3 6

基金资助:国家自然科学基金(51574147);辽宁省教育厅重点项目(L2017LZD004)

通讯作者: 何川 E-mail: cx0402@sina.com

Corresponding author: HE Chuan E-mail: cx0402@sina.com

作者简介: 陈旭，女，1974年生，博士，教授

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引用本文:

陈旭, 李帅兵, 郑忠硕, 肖继博, 明男希, 何川. X70管线钢在大庆土壤环境中微生物腐蚀行为研究[J]. 中国腐蚀与防护学报, 2020, 40(2): 175-181.
Xu CHEN, Shuaibing LI, Zhongshuo ZHENG, Jibo XIAO, Nanxi MING, Chuan HE. Microbial Corrosion Behavior of X70 Pipeline Steel in an Artificial Solution for Simulation of Soil Corrosivityat Daqing Area. Journal of Chinese Society for Corrosion and protection, 2020, 40(2): 175-181.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.030 或 https://www.jcscp.org/CN/Y2020/V40/I2/175

图1 SRB在大庆土壤模拟液中的生长曲线

图2 溶液pH值随SRB生长过程的变化

图3 溶液氧化还原电位随SRB生长过程的变化曲线

图4 溶液电导率随SRB生长过程的变化曲线

图5 X70钢在含SRB的大庆土壤模拟溶液中的SEM像和EDS结果

图6 X70钢在含SRB的大庆土壤模拟溶液中浸泡14 d的XRD谱

图7 X70钢在含SRB的大庆模拟溶液中浸泡不同时间的EIS图

图8 X70钢在含SRB的大庆土壤模拟溶液中EIS等效电路图

表1 X70钢在含SRB的大庆土壤模拟溶液中EIS拟合结果

图9 X70钢在含SRB的大庆土壤模拟溶液中浸泡不同时间的极化曲线

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