温度与SRB协同作用下X70钢在海泥模拟溶液中应力腐蚀行为研究

doi:10.11902/1005.4537.2019.004

中国腐蚀与防护学报

2019, Vol. 39

Issue (6): 477-483 DOI: 10.11902/1005.4537.2019.004

研究报告

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温度与SRB协同作用下X70钢在海泥模拟溶液中应力腐蚀行为研究

陈旭¹(

),马炯¹,李鑫¹,吴明^1,²,宋博²

1. 辽宁石油化工大学石油天然气工程学院抚顺 113001
2. 海洋石油工程股份有限公司天津 300451

Synergistic Effect of SRB and Temperature on Stress Corrosion Cracking of X70 Steel in an ArtificialSea Mud Solution

CHEN Xu¹(

),MA Jiong¹,LI Xin¹,WU Ming^1,²,SONG Bo²

1. College of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China
2. Offshore Oil Engineering Co. , Ltd. , Tianjin 300451, China

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摘要:

研究了温度对硫酸盐还原菌 (SRB) 活性的影响，并采用慢应变速率拉伸实验研究了不同温度下X70钢在含SRB的海泥模拟溶液中应力腐蚀行为及其开裂机理。结果表明，SRB在海泥模拟溶液中生存温度范围为20~40 ℃，且随温度增加，SRB活性增加，数量增大。X70钢表面生物膜保护性与SRB活性和数量密切相关。20 ℃时，由于SRB数量最少，X70钢在含SRB海泥中应力腐蚀开裂 (SCC) 敏感性最小；30 ℃时，X70钢表面的生物膜与基体金属构成大阴极小阳极面积比的腐蚀原电池，耐蚀性最低，此时SCC机理为阳极溶解和氢致开裂共同作用下的混合断裂；40 ℃时SRB活性最好，X70钢表面形成较为完整生物膜，耐蚀性最好，但SCC敏感性最高，其开裂机理为氢致开裂。

关键词 ： X70钢, 海泥模拟溶液, 温度, 硫酸盐还原菌, 应力腐蚀开裂

Abstract：

The stress corrosion cracking (SCC) behavior of X70 steel in an artificial sea mud solution containing SRB at different temperatures were studied by slow strain rate tensile tests. The results showed that SRB survived in the range of 20~40 ℃ in the artificial sea mud solution. The temperature has a great influence on the SRB activity. The activity and amount of SRB increased with the increase of temperature. The protectiveness of the biofilm formed on X70 steel surface was closely related with the activity and quantity of SRB. The amount of SRB was the least at 20 ℃, which resulted in the lowest SCC sensitivity of X70 steel in the simulated sea mud solution. At 30 ℃, corrosion galvanic cell with large ratio of cathode area to anode area could formed between the biofilm and the steel substrate, while the fracture of X70 steel was the mixed ductile-brittle fracture due to the action of anodic dissolution and hydrogen-induced cracking. The relatively complete biofilm formed on X70 steel at 40 ℃, in that case however, X70 steel exhibited the highest SCC sensitivity and the cracking mechanism was hydrogen induced cracking.

Key words： X70 steel artificial sea mud solution temperature sulfate-reducing bacteria stress corrosion cracking

收稿日期: 2019-01-08

ZTFLH:

TG174.36

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: 陈旭 E-mail: cx0402@sina.com

Corresponding author: Xu CHEN 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,马炯,李鑫,吴明,宋博. 温度与SRB协同作用下X70钢在海泥模拟溶液中应力腐蚀行为研究[J]. 中国腐蚀与防护学报, 2019, 39(6): 477-483.
Xu CHEN, Jiong MA, Xin LI, Ming WU, Bo SONG. Synergistic Effect of SRB and Temperature on Stress Corrosion Cracking of X70 Steel in an ArtificialSea Mud Solution. Journal of Chinese Society for Corrosion and protection, 2019, 39(6): 477-483.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.004 或 https://www.jcscp.org/CN/Y2019/V39/I6/477

图1 SSRT试样示意图

图2 SRB在不同温度下南海海泥模拟溶液中的生长曲线

图3 X70钢在不同温度含SRB的海泥溶液中的Ecorr

图4 X70钢在不同温度下含SRB海泥模拟溶液中的SSRT曲线

图5 X70钢在不同温度下含SRB海泥模拟溶液中延伸率和断面收缩率的变化

图6 X70钢在不同温度含SRB海泥溶液中的断口SEM像

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