磁场对X80管线钢在沈阳草甸土中腐蚀行为的影响

doi:10.11902/1005.4537.2016.001

中国腐蚀与防护学报

2017, Vol. 37

Issue (2): 148-154 DOI: 10.11902/1005.4537.2016.001

研究报告

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磁场对X80管线钢在沈阳草甸土中腐蚀行为的影响

张康南,吴明(

),谢飞,王丹,伞宇曦,江峰

辽宁石油化工大学石油天然气工程学院抚顺 113001

Effect of Magnetic Field on Corrosion of X80 Pipeline Steel in Meadow Soil at Shenyang Area

Kangnan ZHANG,Ming WU(

),Fei XIE,Dan WANG,Yuxi SAN,Feng JIANG

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

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摘要:

采用失重法并结合XRD,SEM和EDS等手段,研究了磁场对X80管线钢在沈阳草甸土中腐蚀行为的影响规律。结果表明：磁场的存在促进了X80管线钢在沈阳土壤中的腐蚀;与无磁场相比,外加磁场下X80钢电极表面腐蚀产物出现了疏松多孔型的FeO(OH),导致产物膜保护性减弱;随着磁场强度的增大,腐蚀产物中Fe₃O₄含量降低,FeO(OH) 含量增多,产物膜保护性逐渐减弱,X80钢腐蚀速率逐渐增加,但增大的幅度逐渐减小。磁场强度增大到一定程度会抑制完整产物膜的形成,当磁场达到20 mT时,X80钢年平均腐蚀速率达到73.799 μm/a,产物膜完整性差,出现了明显的裂纹,腐蚀现象最为严重,这是由于磁场能够使单个氧化物晶粒沿择优取向生长的缘故。

关键词 ：磁场, X80管线钢, 草甸土, 腐蚀

Abstract：

The influence of magnetic field on the corrosion of X80 pipeline steel in meadow soil at Shenyang area was investigated by means of mass loss method, X-ray diffractometer (XRD), scanning electron microscope (SEM), and energy dispersive spectrometer (EDS). The results indicated that the magnetic field accelerated the corrosion rate of X80 pipeline steel in the soil. In contrast to the circumstance without magnetic field, porous FeO(OH) emerged on the X80 steel electrode surface under magnetic field which weakened the protectiveness of the formed scales. With the increase of the magnetic field strength, Fe₃O₄ content decreased and FeO(OH) content increased in the corrosion products, which led to the increase of the corrosion rate of X80 steel. However, the increment of the corrosion rate slowed down during the process. As the magnetic field intensity increases to a certain extent, the formation of an integrated corrosion product may be suppressed. As the magnetic field intensity reached to 20 mT, the integrity of the formed scale became poor with cracks, thereby the corrosion rate of X80 steel increased to 73.799 μm/a. These phenomena may be ascribed to that the magnetic field facilitates the preferred oriented growth of oxide grains.

Key words： magnetic field X80 pipeline steel meadow soil corrosion

收稿日期: 2016-01-03

基金资助:国家自然科学基金 (51574147) 和辽宁省科学研究基金 (L2014156)

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引用本文:

张康南,吴明,谢飞,王丹,伞宇曦,江峰. 磁场对X80管线钢在沈阳草甸土中腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2017, 37(2): 148-154.
Kangnan ZHANG, Ming WU, Fei XIE, Dan WANG, Yuxi SAN, Feng JIANG. Effect of Magnetic Field on Corrosion of X80 Pipeline Steel in Meadow Soil at Shenyang Area. Journal of Chinese Society for Corrosion and protection, 2017, 37(2): 148-154.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.001 或 https://www.jcscp.org/CN/Y2017/V37/I2/148

图1 自制密封聚氯乙烯容器

图2 X80管线钢微观组织

图3 X80钢试样在不同磁场强度作用下的沈阳草甸土中浸没182 d后的平均年腐蚀速率和穿透深度折线图

图4 X80钢试样在不同磁场强度下沈阳草甸土中埋置182 d后的宏观形貌

图5 X80钢试样在不同磁场强度下沈阳草甸土中浸没182 d后腐蚀产物的XRD谱

图6 X80钢试样在不同磁场强度下沈阳草甸土中埋置182 d后的表面SEM像

图7 X80钢试样在不同磁场强度下沈阳草甸土中埋置182 d形成的腐蚀产物膜的EDS分析结果

图8 X80钢试样土壤埋置182 d并去除腐蚀产物后的表面形貌

表1 X80钢试样产物膜的EDS分析结果

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