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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.
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Received: 03 January 2016
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Fund: Supported by National Natural Science Foundation of China (51574147) and Liaoning Science Research Foundation (L2014156) |
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