显微组织对X70钢在含有硫酸盐还原菌的3.5%NaCl溶液中腐蚀行为的影响

doi:10.11902/1005.4537.2017.001

中国腐蚀与防护学报

2017, Vol. 37

Issue (2): 168-174 DOI: 10.11902/1005.4537.2017.001

研究报告

本期目录 | 过刊浏览

显微组织对X70钢在含有硫酸盐还原菌的3.5%NaCl溶液中腐蚀行为的影响

滕彧,陈旭(

),何川,王义闯,王冰

辽宁石油化工大学石油天然气工程学院抚顺 113001

Effect of Microstructure on Corrosion Behavior of X70 Steel in 3.5%NaCl Solution with SRB

Yu TENG,Xu CHEN(

),Chuan HE,Yichuang WANG,Bing WANG

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

全文: PDF(3841 KB) HTML

摘要:

通过空冷、水冷和炉冷3种热处理方法得到不同显微组织的X70钢。采用SEM和EDS分析了不同显微组织X70钢在含有硫酸盐还原菌 (SRB) 的3.5% (质量分数) NaCl溶液中的腐蚀形貌和腐蚀产物成分。采用动电位极化和电化学阻抗谱技术研究不同显微组织X70钢的电化学行为。结果表明,X70钢的原始组织为铁素体+珠光体;空冷组织为粒状珠光体分布在铁素体晶界上;炉冷组织由片状珠光体和先共析铁素体组成;水冷组织主要由板条状马氏体和少量块状铁素体组成。各热处理条件下试样在有菌介质中浸泡初期表面覆盖一层致密的生物膜,对电极起到了保护作用。水冷和空冷试样表面生物膜在浸泡第8和10 d后破裂,而炉冷和原始试样表面的生物膜完整性则较好;在有SRB的3.5%NaCl溶液中X70钢炉冷试样的耐蚀性最好,水冷试样的耐蚀性最差。

关键词 ： X70钢, 显微组织, 硫酸盐还原菌, 电化学, 腐蚀

Abstract：

X70 steels with different microstructure were obtained by heat treating at 1050 ℃ for 3 h and subsequently air cooling, water cooling and furnace cooling respectively. Corrosion behavior of the X70 steels with different microstructure in 3.5%(mass fraction)NaCl solution with sulfate reducing bacteria (SRB) was studied by means of potentiodynamic polarization measurement and electrochemical impedance spectroscopy (EIS) as well as SEM and EDS. The results showed that the as received X70 steel shows a microstructure composed of ferrite and pearlite; the air cooling steel composed of globular pearlite distributed along the ferrite grain boundaries; furnace cooling steel composed of lamellar pearlite and proeutectoid ferrite and water cooling one composed mainly of lath martensite and a small amount of blocky ferrite. In the initial stage of corrosion in 3.5%NaCl solution with sulfate reducing bacteria (SRB), the test steels were all covered with a compact biofilm, which played a roll in protection to the substrate. However fractures occurred for the biofilms formed on the water cooling- and air cooling-steels after immersion for 8 and 10 d respectively, while the biofilms kept integrity on the furnace cooling- and as received-steels. The corrosion resistance of the furnace cooling- steel was best, and the water cooling-steel was worst in 3.5%NaCl solution with SRB.

Key words： X70 steel microstructure sulfate reducing bacteria electrochemical corrosion

收稿日期: 2017-01-03

基金资助:国家自然科学基金 (51201009) 和辽宁省自然科学基金 (2013020078)

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引用本文:

滕彧,陈旭,何川,王义闯,王冰. 显微组织对X70钢在含有硫酸盐还原菌的3.5%NaCl溶液中腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2017, 37(2): 168-174.
Yu TENG, Xu CHEN, Chuan HE, Yichuang WANG, Bing WANG. Effect of Microstructure on Corrosion Behavior of X70 Steel in 3.5%NaCl Solution with SRB. Journal of Chinese Society for Corrosion and protection, 2017, 37(2): 168-174.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.001 或 https://www.jcscp.org/CN/Y2017/V37/I2/168

图1 不同条件热处理的X70钢的显微组织

图2 不同条件热处理的X70钢试样在含有SRB的3.5%NaCl溶液中浸泡14 d后的SEM像和EDS结果

图3 不同条件热处理的X70钢在含有SRB的3.5%NaCl溶液中的自腐蚀电位

图4 不同条件热处理的X70钢在含有SRB的3.5%NaCl溶液中的极化曲线

表1 极化曲线的拟合结果

图5 不同条件热处理的X70钢在含有SRB的3.5%NaCl溶液中的EIS

图6 EIS等效电路

表2 EIS等效电路拟合结果

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