铁磁性平板构件腐蚀缺陷的脉冲涡流检测

Pulsed Eddy Current Testing of Corrosion Defects in Ferromagnetic Plate Specimen

为检测铁磁性平板构件背部的小型点腐蚀缺陷,使用脉冲涡流检测的方法实现缺陷的检测与识别。基于脉冲涡流检测技术,设计脉冲涡流传感器,在激励频率为32、16、8、4 Hz的低频下对厚度为3、6、9 mm的平板上的腐蚀缺陷点进行了试验。检测结果表明,使用脉冲涡流检测技术可检测到深度1 mm、直径2 mm的圆形点腐蚀缺陷,能有效检测出铁磁性平板表面及背部的小型点蚀缺陷。

In order to detect small pitting corrosion defects on the back of the ferromagnetic plate member,a method of pulsed eddy current detection was used to detect and identify the back defects of the test piece.Based on the pulse eddy current testing technology,the pulsed eddy current sensor was designed to test the corrosion defects on three different thickness plates of 3,6,and 9 mm at the low frequency of excitation frequency of 32,16,8,and 4 Hz.Small pitting defects on the surface and back of the plate,The test results shown that circular pitting corrosion defects with a depth of 1 mm and a diameter of 2 mm can be detected,indicating that small pitting defects on the surface and back of the ferromagnetic plate can be effectively detected.