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

doi:10.11902/1005.4537.2016.001

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

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

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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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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

Received: 03 January 2016

Fund: Supported by National Natural Science Foundation of China (51574147) and Liaoning Science Research Foundation (L2014156)

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Cite this article:

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.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.001 OR https://www.jcscp.org/EN/Y2017/V37/I2/148

Fig.1 Self-made sealed PVC container

Fig.2 Microstructure morphology of X80 pipeline steel

Fig.3 Annual average corrosion rate and average penetration depth of X80 pipeline steel buried for 182 d in Shenyang alpine meadow soil under various magnetic field strength

Fig.4 Optical photographs of X80 pipeline steel buried for 182 d in Shenyang alpine meadow soil under 0 mT (a), 5 mT (b), 10 mT (c), 15 mT (d) and 20 mT (e) magnetic fields

Fig.5 XRD pattern of the corrosion products collected from the surface of X80 pipeline steel buried for 182 d in Shenyang soil under 5 mT (a) and 20 mT (b) magnetic fields

Fig.6 SEM images of X80 pipeline steel buried for 182 d in Shenyang soil under 0 mT (a), 5 mT (b), 10 mT (c), 15 mT (d) and 20 mT (e) magnetic fields

Fig.7 EDS analysis results of corrosion products formed on X80 pipeline steel buried for 182 d in Shenyang soil under 0 mT (a), 5 mT (b), 10 mT (c), 15 mT (d) and 20 mT (e) magnetic fields

Fig.8 Surface morphologies of X80 steel samples after removal of the corrosion products formed during burying for 182 d in Shenyang soil under 0 mT (a), 5 mT (b), 10 mT (c), 15 mT (d) and 20 mT (e) magnetic fields

Table 1 EDS results of the corrosion products of X80 steel (mass fraction / %)

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