硫酸盐还原菌作用下2205双相不锈钢在3.5%NaCl溶液中应力腐蚀开裂行为研究

doi:10.11902/1005.4537.2019.268

中国腐蚀与防护学报

2021, Vol. 41

Issue (1): 43-50 DOI: 10.11902/1005.4537.2019.268

研究报告

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硫酸盐还原菌作用下2205双相不锈钢在3.5%NaCl溶液中应力腐蚀开裂行为研究

王欣彤, 陈旭(

), 韩镇泽, 李承媛, 王岐山

辽宁石油化工大学石油天然气工程学院抚顺 113001

Stress Corrosion Cracking Behavior of 2205 Duplex Stainless Steel in 3.5%NaCl Solution with Sulfate Reducing Bacteria

WANG Xintong, CHEN Xu(

), HAN Zhenze, LI Chengyuan, WANG Qishan

College of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China

全文: PDF(8756 KB) HTML

摘要:

采用动电位极化技术、慢应变速率拉伸实验 (SSRT) 以及扫描电子显微镜 (SEM) 等方法研究了硫酸盐还原菌 (SRB) 新陈代谢对2205双相不锈钢 (DSS) 在3.5% (质量分数) NaCl溶液中的应力腐蚀开裂 (SCC) 行为的影响。结果表明，与无菌溶液中相比，SRB的存在促进了2205DSS的阳极溶解过程，诱发了点蚀，为SCC萌生提供了裂纹源。2205DSS的SCC敏感性与SRB活性浓度呈正相关，在稳定生长期SRB活性浓度最大，此时2205DSS的SCC敏感性最大。2205DSS在含SRB的3.5%NaCl溶液中发生的SCC机理为阳极溶解和氢脆混合控制机制。SRB作用下，2205DSS中铁素体相表现为穿晶解理特征，奥氏体相表现为韧性撕裂的特征，铁素体相具有更高的SCC敏感性。

关键词 ： 2205双相不锈钢, 硫酸盐还原菌, 微生物腐蚀, 应力腐蚀开裂

Abstract：

Materials served in marine environments are not only subjected to the Cl^- and ocean currents, but also suffered from biological fouling. The effect of sulfate reduction bacteria (SRB) metabolism on the stress corrosion cracking (SCC) behavior of 2205 duplex stainless steel (DSS) in 3.5% (mass fraction) NaCl solution were investigated by means of potentiondynamic polarization technology, slow strain rate test (SSRT) and scanning electron microscopy (SEM). The results showed that compared with the sterile solution, the presence of SRB promoted the anodic dissolution process of 2205 DSS in the bacterial solution and induced pitting, which facilitated cracks initiation. The SCC sensitivity of 2205 DSS was positively correlated with the concentration of SRB activity. The SRB activity concentration was the highest during their stable growth period, and the resulted metabolite H₂S could induce the increase of brittleness of the steel. In this case, SCC sensitivity of 2205DSS was the highest. The SCC mechanism of 2205DSS in 3.5%NaCl solution containing SRB was the mutual control of anodic dissolution and hydrogen damage. In the presence of SRB, the ferritic phase in 2205DSS exhibited transgranular cleavage, while the austenitic phase exhibited ductile tearing, and the ferritic phase had higher SCC sensitivity.

Key words： 2205 duplex stainless steel sulfate-reducing bacteria microbiological corrosion stress corrosion cracking

收稿日期: 2019-12-19

ZTFLH:

TG172.5

基金资助:辽宁省教育厅重点项目(L2017LZD004);教育部“春晖”国际合作计划项目

通讯作者: 陈旭 E-mail: cx0402@sina.com

Corresponding author: CHEN Xu E-mail: cx0402@sina.com

作者简介: 王欣彤，女，1995年生，硕士生

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引用本文:

王欣彤, 陈旭, 韩镇泽, 李承媛, 王岐山. 硫酸盐还原菌作用下2205双相不锈钢在3.5%NaCl溶液中应力腐蚀开裂行为研究[J]. 中国腐蚀与防护学报, 2021, 41(1): 43-50.
Xintong WANG, Xu CHEN, Zhenze HAN, Chengyuan LI, Qishan WANG. Stress Corrosion Cracking Behavior of 2205 Duplex Stainless Steel in 3.5%NaCl Solution with Sulfate Reducing Bacteria. Journal of Chinese Society for Corrosion and protection, 2021, 41(1): 43-50.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.268 或 https://www.jcscp.org/CN/Y2021/V41/I1/43

图1 2205DSS的金相显微组织

图2 SSRT试样示意图

图3 SRB在3.5%NaCl溶液中的生长曲线

图4 2205DSS在3.5%NaCl溶液中的极化曲线

表1 2205不锈钢在3.5%NaCl溶液中动电位极化曲线拟合结果

图5 2205DSS在3.5%NaCl溶液中浸泡不同时间的慢拉伸应力-应变曲线

图6 SSRT后2205DSS伸长率和断面收缩率的变化曲线

图7 2205DSS在不同条件下主断口和侧断口形貌

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