武刚,李德君,罗金恒,白强,李丽锋,朱丽霞.16Mn管线钢的焊缝表面冲蚀机理研究[J].表面技术,2020,49(3):205-212.
WU Gang,LI De-jun,LUO Jin-heng,BAI Qiang,LI Li-feng,ZHU Li-xia.Erosion Mechanism of Weld Joint of 16Mn Pipeline Steel[J].Surface Technology,2020,49(3):205-212 |
| 16Mn管线钢的焊缝表面冲蚀机理研究 |
| Erosion Mechanism of Weld Joint of 16Mn Pipeline Steel |
| 投稿时间：2019-02-15 修订日期：2020-03-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2020.03.026 |
| 中文关键词: 16Mn管线钢 焊缝余高 流体模拟 冲蚀 腐蚀 变形磨损 切削效应 |
| 英文关键词:16Mn pipeline steel weld height fluid simulation erosion corrosion deformation wear cutting effect |
| 基金项目:国家“十三五”国家重点研发计划（2017YFC0805804）；陕西省创新人才推进计划-青年科技新星项目（2017KJXX-06） |
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| Author | Institution |
| WU Gang | CNPC Tubular Goods Research Institute State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, Xi’an 710077, China |
| LI De-jun | CNPC Tubular Goods Research Institute State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, Xi’an 710077, China |
| LUO Jin-heng | CNPC Tubular Goods Research Institute State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, Xi’an 710077, China |
| BAI Qiang | CNPC Tubular Goods Research Institute State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, Xi’an 710077, China |
| LI Li-feng | CNPC Tubular Goods Research Institute State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, Xi’an 710077, China |
| ZHU Li-xia | CNPC Tubular Goods Research Institute State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, Xi’an 710077, China |
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| 中文摘要: |
| 目的 在管道工程中，16Mn管线钢异径接头-管体焊缝（简称焊缝）表面冲蚀行为是引发失效的主要原因之一，通过研究焊缝余高和管体流体作用，以此来探究焊缝表面冲蚀机理。方法 以16Mn管线钢为研究对象，针对焊缝区表面冲蚀行为开展基础研究，通过电化学和腐蚀模拟实验，研究了流体初期焊缝区表面腐蚀行为，并通过流体模拟实验，研究了焊缝余高和流体速度对焊缝区冲蚀过程的影响，揭示了管线钢焊缝的冲蚀机理。结果 在腐蚀模拟实验中，焊缝、接头母体和管体的开路电位分别为-0.717、-0.686、-0.687 V，焊缝区发生电化学腐蚀的倾向在模拟腐蚀液中最严重，焊缝的自腐蚀电流密度为7.9 μA/cm2，母材的自腐蚀电流密度为3.2 μA/cm2，焊缝的电化学腐蚀倾向性更大，焊缝区金属腐蚀速率最大，在焊缝表面形成了疏松的FeO产物层。在流体模拟实验中，流体在焊缝余高作用下形成了湍流，流速的增加也提高了湍动能，流速为15 m/s和30 m/s时，焊缝凹槽的深度分别为3 mm和8 mm，焊缝凹槽相差5 mm。湍动能在焊缝余高的FeO腐蚀产物表面产生了变形磨损和切削效应，使得焊缝表面疏松的FeO产物层脱落，加速了腐蚀过程，最终形成了冲蚀凹陷区。结论 16Mn管线钢焊缝的冲蚀行为是腐蚀和流体冲蚀共同作用的结果，可分为初期的腐蚀和流体冲蚀两个阶段，形成了腐蚀与冲蚀循环交替过程。焊缝余高和流体速度对冲蚀影响较大，内焊缝余高和流体速度的增加将导致余高处的湍动能急剧增加，加速焊缝金属腐蚀产物层剥离，导致焊缝表面冲蚀。研究结果可以为管道失效行为和安全服役设计提供理论基础。 |
| 英文摘要: |
| The work aims to explore the erosion mechanism of weld surface by studying the excess height of weld and the fluid action of pipe body since the surface erosion behavior of 16Mn pipeline steel joint-pipe body weld is one of the main causes of failure in pipeline works. 16Mn pipeline steel was taken as the object to carry out basic research on the erosion behavior of the weld zone. The corrosion behavior of the initial fluid weld zone was studied by electrochemical and corrosion simulation experiments, and the influence of residual weld height and fluid velocity on the erosion process of the weld zone was investigated by fluid simulation experiments, which revealed the erosion mechanism of the weld of pipeline steel. In corrosion simulation experiment, the open circuit potentials of weld, joint and tube were -0.717, -0.686 and -0.687 V, respectively. The tendency of electrochemical corrosion in weld zone was the highest in simulated corrosion solution. The self-corrosion current density of the weld was 7.9 μA/cm2, and that of the base metal was 3.2 μA/cm2. The electrochemical corrosion tendency of the weld was greater. Due to the high corrosion rate of the metal in the weld zone, loose FeO product layer was formed on the surface of the weld. In the fluid simulation experiment, the turbulent flow was formed by the residual height of the weld, and the turbulent kinetic energy increased with the increase of the flow rate. When the flow rate was 15 mm/s and 30 m/s, the depth of the weld groove was 3 mm and 8 mm respectively, and the difference of the weld groove was 5 mm. Turbulence energy produced deformation wear and cutting effects on the surface of corrosion products of FeO in excess height of weld, which made the loose FeO product layer on the surface of weld peel off, accelerated the corrosion process, and finally formed erosion depression area. The erosion behavior of 16Mn pipeline steel weld is the result of the interaction of corrosion and fluid erosion. It can be divided into two stages: initial corrosion and fluid erosion, forming the cyclic alternating process of corrosion and erosion. The excess height of weld and fluid velocity has great influence on erosion. The increase of excess height of internal weld and fluid velocity will lead to a sharp increase of turbulent kinetic energy at excess height, accelerate the stripping of corrosion product layer of weld metal, and lead to erosion of weld surface. The research results can provide theoretical basis for failure behavior and safe service design of pipeline. |
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