We investigated erosion-corrosion (E-C) and its mitigation on the internal surface of the expansion segment of N80 steel tube in a loop system using array electrode technique, weight-loss measurement, computational-fluid-dynamics simulation, and surface characterization techniques. The results show that high E-C rates can occur at locations where there is a high flow velocity and/or a strong impact from sand particles, which results in different E-C rates at various locations. Consequently, it can be expected that localized corrosion often occurs in such segments. The E-C rate at each location in the expansion segment can be significantly mitigated with an imidazoline derivative inhibitor, as the resulting inhibitor layer significantly impedes the electrochemical reaction rate. However, we found that this inhibitor layer could not effectively reduce the difference in the erosion rates at different locations on the internal surface of the expansion segment. This means that localized corrosion can still occur at the expansion segment despite the presence of the inhibitor.

我们使用阵列电极技术，重量损失测量，计算流体动力学模拟和表面表征技术，研究了循环系统中N80钢管膨胀段内表面的腐蚀腐蚀（EC）及其缓解措施。结果表明，高EC率可能发生在流速高和/或受到沙粒强烈影响的位置，从而导致不同位置的EC率不同。因此，可以预料在这些段中经常发生局部腐蚀。咪唑啉衍生物抑制剂可大大降低扩展链段每个位置的EC速率，因为所得的抑制剂层会显着阻碍电化学反应速率。然而，我们发现该抑制剂层不能有效地减小膨胀段内表面上不同位置的腐蚀速率差异。这意味着尽管存在抑制剂，局部腐蚀仍会在膨胀段发生。