Volume 37 Issue 6
Dec.  2022
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DU Lili, ZHANG Hongbing, XU Shouwu, ZHANG Kaili, QIU Ping. Study on Atmospheric Corrosion Behavior of Q345R Steel Weld Zone[J]. Development and Application of Materials, 2022, 37(6): 92-101.
Citation: DU Lili, ZHANG Hongbing, XU Shouwu, ZHANG Kaili, QIU Ping. Study on Atmospheric Corrosion Behavior of Q345R Steel Weld Zone[J]. Development and Application of Materials, 2022, 37(6): 92-101.
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Study on Atmospheric Corrosion Behavior of Q345R Steel Weld Zone

  • 1. Beijing Key Laboratory of Failure, Corrosion and Protection of Oil/Gas Equipment Materials, China University of Petroleum (Beijing), Beijing 102249, China;

  • 2. Engineering Department of National Petroleum and Natural Gas Pipeline Network Group Co., Ltd., Beijing 100013, China

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  • Received Date: September 05, 2022
  • Available Online: January 11, 2023
    Graphical Abstract
    • Abstract
  • The atmospheric corrosion characteristics of the weld zone of storage tank steel Q345R are studied, and the corrosion behaviors of the heat affected zone, weld and base metal are analyzed by polarization curve and AC impedance technique. The surface corrosion microstructure and compositions of the samples are characterized by scanning electron microscope and laser Raman spectrometer. The results show that the base metal has the greatest corrosion susceptibility, and the weld zone is more resistant to corrosion than the heat-affected zone. There is some relationship between the corrosion tendency and the microstructure. The microstructure of the weld zone consists of granular bainite and acicular ferrite, and the refinement of the microstructure of this zone can obviously reduce its corrosion susceptibility. The welding process makes the weld almost a non-porous area; therefore, the base metal with micropores has a higher corrosion rate.
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