焊接
腐蚀
材料科学
冶金
扫描电子显微镜
热影响区
点蚀
能量色散X射线光谱学
碳化物
极化(电化学)
光谱学
能谱
复合材料
化学
核物理学
物理化学
物理
量子力学
作者
Wucheng Li,Jianli Zhang,Ping Xin,Zhiping Wen,Hongyang Jing,Lei Zhao,Lianyong Xu,Yongdian Han
出处
期刊:MP MATERIALPRUEFUNG - MP MATERIALS TESTING
[De Gruyter]
日期:2021-07-01
卷期号:63 (7): 617-622
被引量:3
摘要
Abstract On-site investigation, scanning electron microscope, energy dispersive X-ray spectroscopy, and cyclic potentiodynamic polarization test were carried out for failure analysis of the 316 L pipeline in this paper. The visual inspection revealed that the inner wall was covered with severe rust, and obvious misalignment and poor appearance were found in the weld. The energy dispersive X-ray spectroscopy result identified the presence of Cl in the inner wall of the pipeline. Some carbides of Cr and Mo precipitated in the heat affected zone, which partially deteriorated the corrosion resistance. The cyclic potentiodynamic polarization curve proved that the heat affected zone is not only sensitive to pitting corrosion, but also has inferior repassivation ability. Finally, the pitting preferentially occurred in the heat affected zone and gradually developed to leakage.
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