带包覆层铁磁性金属管道局部腐蚀的脉冲涡流检测  

Detection of Localized Corrosion in Ferromagnetic Metal Pipe Under Insulation with Pulsed Eddy Current Testing

作　　者：付跃文[1] 康小伟[1] 喻星星[1] 

机构地区：[1]南昌航空大学无损检测技术教育部重点实验室,江西南昌330063

出　　处：《应用基础与工程科学学报》2013年第4期786-795,共10页Journal of Basic Science and Engineering

基　　金：国家自然科学基金资助项目(51067007);江西省自然科学基金资助项目(2007GZW1530)

摘　　要：为提高脉冲涡流检测技术在检测包覆层下铁磁性金属管道局部腐蚀时的灵敏度,从仿真和实验两个方面对探头设计进行了研究.采用反向联接结构的双线圈作为激励源,达到线圈电流不过大而磁场能够在局部得到聚焦增强的目的.采用有限元仿真比较了单线圈和双线圈激励时磁场及涡流的分布情况和对局部腐蚀型缺陷的检测灵敏度,并进行了系列检测对比实验.仿真与实验结果相一致,表明使用反向联接双线圈激励探头对带包覆层管道局部腐蚀类缺陷进行脉冲涡流检测可以达到远高于单线圈激励检测的灵敏度.本研究可为带包覆层金属管道局部腐蚀的脉冲涡流检测探头设计提供参考.Probe design was studied by simulation and experiments to improve detection sensitivity of localized corrosion in ferromagnetic metal pipe under insulation with pulsed eddy current（ PEC ） non-destructive testing. A reversely-connected dual coil was used as excitation source to produce a focused and intense magnetic field without the need of large current in the coil. Finite element method was used to simulate and compare the distribution of magnetic field and eddy current of single coil excitation and dual coil excitation, and a series of experiments were then performed. The experimental results agreed well with the simulation and showed that a much higher sensitivity was achieved using reversely-connected dual coil as excitation than using single coil excitation in the localized corrosion detection of ferromagnetic metal pipe under insulation with PEC testing. This research provides reference for probe design in the localized corrosion detection in metal pipe under insulation with PEC method.

关 键 词：脉冲涡流 包覆层 管道 腐蚀 有限元 

分 类 号：TG115.28[金属学及工艺—物理冶金]