王浩千,王丹,侯政煜,梁守才,张晓龙,谢飞.平行磁场对含V型缺陷的管线钢的腐蚀行为影响[J].表面技术,2024,53(2):78-87.
WANG Haoqian,WANG Dan,HOU Zhengyu,LIANG Shoucai,ZHANG Xiaolong,XIE Fei.Effect of Parallel Magnetic Field on Corrosion Behavior of Pipeline Steel with V-type Flaws[J].Surface Technology,2024,53(2):78-87 |
| 平行磁场对含V型缺陷的管线钢的腐蚀行为影响 |
| Effect of Parallel Magnetic Field on Corrosion Behavior of Pipeline Steel with V-type Flaws |
| 投稿时间：2022-09-06 修订日期：2023-06-14 |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.02.007 |
| 中文关键词: 平行磁场 腐蚀 X70钢 V型缺陷 库尔勒土壤 |
| 英文关键词:parallel magnetic field corrosion X70 steel V-type flaws Ku'erle soil |
| 基金项目:国家自然科学基金资助项目(51604150);辽宁省自然科学基金面上项目(2022-MS-362) |
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| Author | Institution |
| WANG Haoqian | School of Petroleum and Natural Gas Engineering, Liaoning Petrochemical University, Liaoning Fushun 113001, China |
| WANG Dan | School of Petroleum and Natural Gas Engineering, Liaoning Petrochemical University, Liaoning Fushun 113001, China |
| HOU Zhengyu | Liaohe Oil Field of CNPC, Liaoning Panjin 124010, China |
| LIANG Shoucai | Liaohe Oil Field of CNPC, Liaoning Panjin 124010, China |
| ZHANG Xiaolong | Liaohe Oil Field of CNPC, Liaoning Panjin 124010, China |
| XIE Fei | School of Petroleum and Natural Gas Engineering, Liaoning Petrochemical University, Liaoning Fushun 113001, China |
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| 中文摘要: |
| 目的 研究平行磁场对含V型腐蚀缺陷的X70管线钢在库尔勒土壤模拟溶液中的腐蚀行为影响。方法 利用失重法来计算含V型腐蚀缺陷的X70管线钢在不同平行磁场强度下的腐蚀速率。采用扫描电子显微镜和X射线光电子能谱(XPS)对V型槽槽内外腐蚀样貌及腐蚀产物进行分析，并分析出各腐蚀产物相对含量。结果 发现平行磁场的加入，加速了V型槽槽外的腐蚀，减缓了V型槽槽内的腐蚀。随着磁场强度的增加，平行磁场对V型槽槽外和槽内的促进及抑制作用加强，无磁场时V型槽槽外腐蚀产物为Fe2O3，然而随着磁场强度的增加，V型槽槽外腐蚀产物Fe2O3的相对含量增多，单质Fe的相对含量减少。而V型槽槽内的腐蚀产物Fe2O3随着磁场强度的增加逐渐减少，并且在40 mT时腐蚀产物变化为Fe3O4，70 mT时腐蚀产物变化为FeO。结论 平行磁场的存在加速了V型槽槽外腐蚀，抑制了V型槽槽内腐蚀，并随着磁场强度的增加，磁场对管线钢腐蚀的促进及抑制作用均增强。本文的研究结果对理解管线钢在磁场作用下的腐蚀失效行为有一定的参考价值。 |
| 英文摘要: |
| The corrosion behavior of X70 pipeline steel with V-type corrosion flaws in Ku'erle simulated soil solution was investigated using a parallel magnetic field. The weight loss technique was used to calculate the corrosion rate of X70 pipeline steel with V-type corrosion flaws under varying parallel magnetic field intensities. The corrosion morphology and corrosion products inside and outside the V-groove were analyzed with a metal electron microscopy and an X-ray photoelectron spectroscopy (XPS), and the relative content of each corrosion product was analyzed. The corrosion current density of X70 pipeline steel with V-type corrosion flaws under different parallel magnetic field intensities was analyzed by the AC impedance technique, and the equivalent circuit diagram was fitted by the potentiodynamic polarization technique to analyze the resistance in the reaction process. With the increase of magnetic field intensity, the corrosion rate gradually accelerated. However, the parallel magnetic field had different effects on the corrosion outside and inside the V-groove. The corrosion current density without a magnetic field was 6.83 μA/cm2, the polarization resistance was 1 197.78 Ω. The corrosion product was Fe2O3. When the magnetic field intensity was 10 mT, the corrosion current density in the V-groove was 5.221μA/cm2, the polarization resistance was 1 718.59 Ω, and the corrosion product was Fe3O4; while the corrosion current density outside the V-groove was 7.88 μA/cm2, the polarization resistance was 811.14 Ω, and the corrosion product was Fe2O3. However, with the increase of the magnetic field intensity, the corrosion current density outside the V-groove gradually increased, and the polarization resistance gradually decreased. The relative content of corrosion product Fe2O3 increased and the relative content of Fe decreased. The corrosion current density in the V-groove gradually decreased, the polarization resistance gradually increased, and the relative content of corrosion product Fe2O3 decreased. The corrosion product changed to Fe3O4 at 40 mT and FeO at 70 mT. In addition to it anyway, corrosion morphology illustrated that, compared with no magnetic field, the corrosion pit outside the V-groove increased dramatically when the parallel magnetic field was applied, while the corrosion pit inside the V-groove became smaller. With increasing magnetic field intensity, the number of corrosion pits outside the V-groove grew from a small number at 10 mT to a substantial number at 40 mT, and the individual size of the corrosion pits steadily increased from 40 mT to 70 mT. This was because when the magnetic field acted on the surface of the V-groove, due to its uneven surface, the magnetic field would form a magnetic field gradient force at the V-groove, by attracting paramagnetic substances, the force would repel diamagnetic substances to move inside and outside the groove, thus affecting the corrosion process. The existence of a parallel magnetic field accelerates the external corrosion of the V-groove and inhibits the internal corrosion of the V-groove. With the increase of magnetic field intensity, the promotion and inhibition of magnetic field on the corrosion of pipeline steel are enhanced. The research results in this paper have a certain reference value for understanding the corrosion failure behavior of pipeline steel under a magnetic field. |
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