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Microstructure, Chemical Composition and Local Corrosion Behavior of a Friction Stud Welding Joint

机译:摩擦螺柱焊接接头的微观结构,化学成分和局部腐蚀行为

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In this paper, friction stud welding technology was used to join a stud and base metal, which were composed of X65 steel. The scanning vibrating electrode technique (SVET) and localized electrochemical impedance spectroscopy (LEIS) were used to investigate the localized corrosion behaviors of the welded joint. Scanning electron microscopy, metallographic microscopy and a micro-hardness tester were used to observe the microstructure and measure the hardness of the welded sample. Raman spectrometry and energy-dispersive spectrometry were used to measure the composition of the weldment before and after corrosion, respectively. The results show that there are the maximum micro-hardness and the densest microstructure in the welded zone compared with the other zones. In addition, alpha-Fe2O3 and Fe3O4 are present in the welded zone. The SVET and LEIS data indicate that the welded zone has the lowest current density and the largest impedance due to the presence of iron oxides and the densest microstructure, thus showing the excellent corrosion resistance. The relationship among microstructure, micro-hardness, chemical composition and local electrochemical behavior was discussed.
机译:本文采用摩擦螺柱焊接技术加入螺柱和基础金属,由X65钢组成。扫描振动电极技术(SVET)和局部电化学阻抗光谱(唯一)用于研究焊接接头的局部腐蚀行为。扫描电子显微镜,金相显微镜和微硬度测试仪用于观察微观结构并测量焊接样品的硬度。拉曼光谱法和能量分散光谱法分别用于测量腐蚀前后焊接的组成。结果表明,与其他区域相比,焊接区中存在最大的微型硬度和密度微观结构。此外,α-Fe2O3和Fe3O4存在于焊接区中。 SVET和烟碱表明,由于存在氧化铁和密度微观结构,焊接区域具有最低电流密度和最大阻抗,因此显示出优异的耐腐蚀性。讨论了微观结构,微硬度,化学成分和局部电化学行为的关系。

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