The presence of welding reinforcement height (WRH) within oil and gas pipelines can lead to micro-turbulence in localized areas during transportation, resulting in corrosion failure. This study employed a modular reconstruction method to simulate and reconstruct X80 steel welded joints, and investigated the erosion-corrosion behavior at the WRH using wire beam microelectrode, electrochemical impedance spectroscopy, and computational fluid dynamics simulations. The results show that the galvanic current density (GCD) in the weld metal exhibits cathodic behavior, while the GCD in the base metal and heat-affected zone shows anodic behavior. The top of WRH is susceptible to corrosion failure. As the radius of WRH increases, the corrosion rate also increases. Additionally, the corrosion rate increases similarly with an increase in flow velocity. The galvanic corrosion intensity factor (g) is 0.24, and the local corrosion is moderate. This work has scientific significance in ensuring the long-term safe operation of pipelines and reducing the risk of corrosion failure.

中文翻译：

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动态条件下焊接钢筋高度的腐蚀

油气管道内焊接钢筋高度（WRH）的存在会导致运输过程中局部区域出现微湍流，从而导致腐蚀失效。本研究采用模块化重建方法来模拟和重建 X80 钢焊接接头，并使用线束微电极、电化学阻抗谱和计算流体动力学模拟研究 WRH 的冲蚀腐蚀行为。结果表明，焊缝金属中的电偶电流密度（GCD）表现出阴极行为，而母材和热影响区的GCD表现出阳极行为。 WRH 顶部容易发生腐蚀失效。随着WRH半径的增加，腐蚀速率也会增加。此外，腐蚀速率同样随着流速的增加而增加。电偶腐蚀强度因子（g）为0.24，局部腐蚀为中等程度。该工作对于保障管道长期安全运行、降低腐蚀失效风险具有科学意义。