许宏良,殷苏民.对45#钢管道的缝隙腐蚀模拟研究[J].表面技术,2016,45(12):161-166.
XU Hong-liang,YIN Su-min.Simulation of Crevice Corrosion in 45# Steel Pipeline[J].Surface Technology,2016,45(12):161-166 |
| 对45#钢管道的缝隙腐蚀模拟研究 |
| Simulation of Crevice Corrosion in 45# Steel Pipeline |
| 投稿时间：2016-05-05 修订日期：2016-12-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2016.12.026 |
| 中文关键词: 金属管道 剥离涂层 缝隙腐蚀 阴极保护 电位分布 几何模型 仿真 |
| 英文关键词:metal pipeline peeling coating crevice corrosion cathodic protection potential distribution geometry model simulation |
| 基金项目:江苏省科技支撑计划资助项目（BE2013009-1） |
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| 中文摘要: |
| 目的 预测埋地金属管道缝隙表面电位分布和腐蚀速度。方法 造金属管道缝隙腐蚀的几何模型，对腐蚀管道采取阴极保护，推导腐蚀管道的电化学反应动力方程式。对几何仿真模型的初始条件及边界条件进行约束，采用MATLAB软件对阴极保护电位分布规律和表面缝隙腐蚀速度的几何模型进行了仿真，并且与实验测量结果进行对比，得出了仿真结果与实验结果的相对误差。结果 采用阴极保护金属管道表面缝隙腐蚀的底部仿真电位随时间的增加而反向增大，在极化时间50 h内最大电位为−8.6 V。采用阴极保护金属管道表面缝隙腐蚀的仿真电位随缝隙深度的增加而反向减小，在距离缝隙表面10 cm内最小值为−0.78 V。采用阴极保护金属管道表面缝隙的仿真腐蚀速度随时间的增加而逐渐减小，在前5年内腐蚀速度最小值达到0.334 mm/a。同时，电位分布和腐蚀速度的仿真值与实验测量值的相对误差在5%以内，误差较小。结论 采用矩形缝隙模型可以近似预测阴极保护的电位分布和缝隙表面腐蚀速度，从而降低了金属管道腐蚀速度，避免了金属管道发生灾难性的事故。 |
| 英文摘要: |
| The work aims to predict surface potential distribution and corrosion rate of buried metal pipeline. The geometry model of crevice corrosion of metal pipeline was constructed, and the electrochemical reaction dynamic equation of corroded pipeline was derived by providing cathodic protection. Initial conditions and boundary conditions of geometric simulation model were constrained. MATLAB software was utilized to simulate the geometric model covering potential distribution law of cathodic protection and corrosion speed of surface crevice, and the simulation results were compared with experimental measurements to obtain relative error between the simulation results and experimental results. Bottom simulation potential of surface crevice corrosion in metal pipeline under cathodic protection increased reversely with the increase of the time, and the maximum potential in 50 h of polarization time was –8.6 V. Simulation potential of surface crevice corrosion in metal pipeline under cathodic protection decreased reversely with the increase of crevice depth, and the minimum potential at a distance within 10 cm from the crevice surface was -0.78 V. The simulated corrosion rate of surface crevice in metal pipeline under cathodic protection decreased gradually with the increase of time, and the minimum corrosion rate was 0.334 mm/a in the first 5 years. Meanwhile, the relative error between simulation value and experimental measurement was less than 5%. Hence the rectangular crevice model can be used to predict potential distribution of cathodic protection and corrosion rate of crevice surface, further reducing the corrosion rate of metal pipeline and preventing catastrophic accidents. |
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