X70管线钢在热带海水-海泥跃变区的腐蚀行为研究

doi:10.11902/1005.4537.2017.183

中国腐蚀与防护学报

2018, Vol. 38

Issue (5): 415-423 DOI: 10.11902/1005.4537.2017.183

研究报告

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X70管线钢在热带海水-海泥跃变区的腐蚀行为研究

邓培昌¹, 刘泉兵¹, 李子运², 王贵², 胡杰珍²(

), 王勰²

1 广东海洋大学化学与环境学院湛江 524088
2 广东海洋大学机械与动力学院湛江 524088

Corrosion Behavior of X70 Pipeline Steel in the Tropical Juncture Area of Seawater-Sea Mud

Peichang DENG¹, Quanbing LIU¹, Ziyun LI², Gui WANG², Jiezhen HU²(

), Xie WANG²

1 College of Chemistry and Environment, Guangdong Ocean University, Zhanjiang 524088, China
2 College of Mechanical and Power Engineering, Guangdong Ocean University, Zhanjiang 524088, China

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摘要:

利用阵列电极技术、线性极化和电化学阻抗等电化学分析技术及腐蚀形貌观察和腐蚀产物物相分析,研究了X70管线钢在海水-海泥跃变区中的腐蚀行为与规律。结果表明,X70管线钢在海水-海泥跃变区形成宏观氧浓差电池,海泥区域及近海水-海泥界面的海水区域为电偶腐蚀阳极区域,海水区域为电偶腐蚀阴极区域;腐蚀后期阶段,海泥下部的电极变为阴极,成为主要的阴极反应区域。海水中的电极腐蚀速率大于海泥中的,而在近海水-海泥界面的区域形成了腐蚀电流峰。海水中高含量的溶解氧促进了电极表面腐蚀产物层的致密化,电荷转移电阻增大;在腐蚀后期,海泥底部硫酸盐还原菌参与了腐蚀反应,生成了硫化物,导致阴极电流密度增大,加快了整个电极的腐蚀速率。

关键词 ：阵列电极, 海水-海泥跃变区, 电偶腐蚀, X70管线钢, 电化学阻抗谱

Abstract：

The corrosion behavior of X70 pipeline steel in the tropical juncture area of seawater-sea mud has been studied by means of wire beam electrode technique, linear polarization, electrochemical impedance spectroscopy and other electrochemical analysis technique, coupled with the methods of corrosion morphology observation and corrosion products analysis. The results show that X70 pipeline steel has formed an oxygen concentration cell in the juncture area of seawater-sea mud, the electrodes in the sea mud and in the vicinity of interface of seawater-sea mud act as anode, and the electrodes in the seawater act as cathode. In the last stage of corrosion, the electrodes in the bottom of sea mud become cathode region where the main cathode reaction is occurred. The corrosion rate of the electrodes in the seawater is greater than the electrodes in the sea mud, and there is a peak of corrosion current in the vicinity of interface of seawater-sea mud. Dissolved oxygen promotes corrosion products gradually firmly and densely, the charge transfer resistance increased with the time, sulfate reducting bacteria in the bottom of the sea mud participate in the reaction, produced iron sulfide, the corrosion rate of the whole electrodes speed up with the cathode current density increased.

Key words： wire beam electrode juncture area of seawater-sea mud galvanic corrosion X70 pipeline steel electrochemical impedance spectroscopy

收稿日期: 2017-11-09

ZTFLH:

TG174

基金资助:广东省自然科学基金 (2015A030313619),广东省省级科技计划项目 (2016A020225004) 和湛江市科技计划项目(2015A02024和2014C01003)

作者简介:

作者简介邓培昌,男,1975年生,博士,副教授

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引用本文:

邓培昌, 刘泉兵, 李子运, 王贵, 胡杰珍, 王勰. X70管线钢在热带海水-海泥跃变区的腐蚀行为研究[J]. 中国腐蚀与防护学报, 2018, 38(5): 415-423.
Peichang DENG, Quanbing LIU, Ziyun LI, Gui WANG, Jiezhen HU, Xie WANG. Corrosion Behavior of X70 Pipeline Steel in the Tropical Juncture Area of Seawater-Sea Mud. Journal of Chinese Society for Corrosion and protection, 2018, 38(5): 415-423.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.183 或 https://www.jcscp.org/CN/Y2018/V38/I5/415

表1 海泥和海水物理化学性质

图1 C列,D列和E列电极在海水-海泥跃变区中分别暴露15,30和45 d后的微观腐蚀形貌

图2 X70管线钢在海水-海泥跃变区中分别暴露15,30和45 d后腐蚀产物的EDS结果

图3 X70管线钢在海水-海泥跃变区中暴露45 d后腐蚀产物的XRD谱

图4 X70管线钢在海水-海泥跃变区暴露不同周期的腐蚀速率

图5 阵列电极在海水-海泥跃变区暴露不同时间的电偶电流记录图

图6 阵列电极在海水-海泥跃变区暴露不同时间的电偶电流密度分析图

图7 X70管线钢在海水-海泥跃变区暴露不同时间的腐蚀电流与腐蚀电位变化曲线

图8 海水-海泥跃变区中不同位置的电极随周期变化的Nyquist谱

图9 海水-海泥跃变区中不同位置的电极随周期变化的Bode图

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