杨永,冉文燊,李林涛,孙明,贺小刚.漏磁场对鹰潭土壤模拟液中管线钢交流腐蚀行为的影响[J].表面技术,2023,52(5):189-196, 225.
YANG Yong,RAN Wen-shen,LI Lin-tao,SUN Ming,HE Xiao-gang.Effect of Magnetic Field on AC Corrosion Behavior of Pipeline Steel in Simulated Yingtan Soil Solution[J].Surface Technology,2023,52(5):189-196, 225 |
| 漏磁场对鹰潭土壤模拟液中管线钢交流腐蚀行为的影响 |
| Effect of Magnetic Field on AC Corrosion Behavior of Pipeline Steel in Simulated Yingtan Soil Solution |
| |
| DOI：10.16490/j.cnki.issn.1001-3660.2023.05.018 |
| 中文关键词: 磁场 X52管线钢 交流杂散电流 腐蚀行为 鹰潭土壤模拟液 |
| 英文关键词:magnetic field X52 pipeline steel AC stray current corrosion behavior simulated Yingtan soil solution |
| 基金项目:市场监管总局科技计划项目(2019MK136);中国特检院科研项目(2019青年03) |
|
|
| Author | Institution |
| YANG Yong | China Special Equipment Inspection and Research Institute, Beijing 100029, China |
| RAN Wen-shen | China Special Equipment Inspection and Research Institute, Beijing 100029, China |
| LI Lin-tao | China Special Equipment Inspection and Research Institute, Beijing 100029, China |
| SUN Ming | China Special Equipment Inspection and Research Institute, Beijing 100029, China |
| HE Xiao-gang | Beijing Special Equipment Inspection and Testing Research Institute, Beijing 100029, China |
|
| 摘要点击次数: |
| 全文下载次数: |
| 中文摘要: |
| 目的 探究管体磁化产生的磁场对油气管道交流杂散电流腐蚀行为的影响。方法 采用自行设计试验装置模拟管道真实漏磁场，以开路电位、高频电位测量、动电位极化、电化学阻抗谱、表面分析技术及失重法，研究了鹰潭土壤模拟液中磁化和未磁化的X52管线钢试样交流腐蚀行为的差异。结果 磁化管体的磁场使交流腐蚀电位先负移后正移，交流幅值电位增大，极化电流增加，反应界面电容减小，法拉第电阻增大，交流平均腐蚀速率增大，对腐蚀产物形貌有一定影响，但对腐蚀形貌基本无影响。磁场作用机理分析表明，磁场产生的洛伦磁力驱动反应界面附近腐蚀介质运动而增加反应粒子的扩散速率及减小界面扩散层厚度，从而增大交流腐蚀速率。磁场梯度力在一定程度上抑制了阳极反应，促进了阴极反应。结论 漏磁场使管线钢交流杂散电流腐蚀速率大幅提升，但是不改变其均匀腐蚀的形貌，应提高开展过漏磁内检测的油气管道交流杂散电流评价标准。 |
| 英文摘要: |
| Alternating current (AC) interference can cause serious corrosion of oil and gas pipelines and thus cause accident. Magnetic flux leakage (MFL) internal detection is currently the most effective and widely used nondestructive technology for detecting metal damage in oil and gas pipelines. The purpose of this study is to explore the effect of magnetic field on the corrosion behavior of X52 pipeline steel caused by AC stray current, mainly including corrosion rate, corrosion potential, polarization current, corrosion products and corrosion morphology. In order to more realistically simulate the actual situation of the magnetic field generated by the magnetized pipeline, a 10 mm-wide ring was cut from a ϕ219 mm×6 mm pipe, and 650 turns of insulated copper wire (with a copper core diameter of 0.82 mm) were wound, and a slot was cut into the ring to embed the test sample. During the experiment, a 2 A direct current was applied to the insulated copper wire to simulate the magnetization of the sample, and the magnetic field intensity that was calculated was 1.9 kA/m. Open circuit potential, polarization curves, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and weight loss tests were used to study the effect of the magnetic field generated by the magnetized oil and gas pipelines on the AC corrosion behavior of the X52 pipeline steel in simulated Yingtan soil solution. The applied magnetic field made the AC corrosion potential move negatively and then positively, increased the AC amplitude potential, increased the polarization current, decreased the reaction interface capacitance, increased the charge transfer impedance and increased the average AC corrosion rate, had a certain effect on the morphology of corrosion products, but basically had no effect on the corrosion morphology. Compared with the case of a direct application of a magnetic field that was perpendicular or parallel to the working surface of an electrode in most studies, the magnitude of the leakage magnetic field that acted on the electrochemical reaction in this study depended on the strength of the magnetic field loaded in the ring and the surface roughness of the sample (equivalent to numerous tiny defects) or the size and shape of the defects. The Loren magnetic force could increase the diffusion rate of solution particles, thereby reducing the Fe2+ concentration at the electrode/solution interface and the thickness of interfacial diffusion layer, and eventually increasing the corrosion rate. In a nonuniform magnetic field, the magnetic field gradient force caused paramagnetic ions in a non-uniform magnetic field to move to the high magnetic induction intensity region and the diamagnetic ions to move to the low magnetic induction intensity region. The magnetic field gradient could inhibit local corrosion in corrosion pits to a certain extent because magnetic induction intensity and magnetic field gradient in corrosion pits were higher than other areas. The conclusions of this paper indicate that the evaluation standard of AC stray current corrosion of oil and gas pipelines tested by in-line inspections based on the magnetic flux leakage (MFL) principle should be improved. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|
渝公网安备 50010702501715号