精品文档---下载后可任意编辑J55 钢在模拟海水中不同流速下的腐蚀机理讨论中期报告摘要：本讨论旨在探究 J55 钢在模拟海水中不同流速下的腐蚀机理，以期为海洋油气输送管道的腐蚀防护提供参考。讨论采纳了重量损失法、扫描电子显微镜、能谱分析和电化学测试等手段对 J55 钢在不同流速（0.5 m/s、1.0 m/s、1.5 m/s）下的腐蚀行为和机理进行了讨论。结果表明，不同流速下 J55 钢的腐蚀速率均呈现出先增后减的趋势，其中在 1.0 m/s 的流速下，钢材的腐蚀速率最大。扫描电子显微镜和能谱分析结果表明，腐蚀产物主要为 Fe2O3 和Fe3O4。电化学测试结果表明，负极极化曲线下降幅度最小的时间为腐蚀动力学平衡时间，与重量损失法实验结果相吻合。讨论表明，流速对 J55 钢在模拟海水中的腐蚀行为具有重要影响，腐蚀速率受流场的影响而发生改变。本次实验结果可以为海洋油气输送管道的腐蚀防护提供一定的理论和实验基础。关键词：J55 钢；流速；腐蚀机理；海洋油气输送管道Abstract：The purpose of this study is to explore the corrosion mechanism of J55 steel in simulated seawater under different flow rates, in order to provide a reference for the corrosion protection of marine oil and gas pipelines.Weight loss method, scanning electron microscopy, energy spectrum analysis and electrochemical testing were used to study the corrosion behavior and mechanism of J55 steel under different flow rates (0.5 m/s, 1.0 m/s, 1.5 m/s). The results showed that the corrosion rate of J55 steel under different flow rates showed a trend of first increasing and then decreasing, and the corrosion rate was the largest at a flow rate of 1.0 m/s. Scanning electron microscopy and energy spectrum analysis showed that the corrosion products were mainly Fe2O3 and Fe3O4. Electrochemical testing results showed that the time with the smallest drop in the negative polarization curve was the corrosion kinetic equilibrium time, which was consistent with the experimental results of weight loss method.精品文档---下载后可任意编辑The study shows that flow rate has an important influence on the corrosion behavior of J55 steel in simulated seawater, and the corrosion rate changes with the influence of the flow field. The experimental results can provide a certain theoretical and experimental basis for the corrosion protection of marine oil and gas pipelines.Keywords: J55 steel; flow rate; corrosion mechanism; marine oil and gas pipeline.
