Corrosion Detection of Thick-Walled Pipes Based on Magnetic Permeability Perturbation
Under complex working conditions,flow corrosion can lead to changes in local wall thickness of thick-walled pipes.The traditional electromagnetic detection method is difficult to evaluate the deep defects.Because of the high sensitivity of the deep-buried defective steel pipe,the permeability disturbance detection method is used to detect the corrosion defects of the thick wall pipe.Direct current magnetization is applied to the ferromagnetic material,and the surface permeability disturbance is caused by the internal magnetic field disturbance caused by the thin wall,which is detected by the eddy current probe.The experimental results show that the amplitude of the detected voltage signal increases with the increase of the thickness of the tube wall thinning,and the condition of 5%of the tube wall thinning can be measured.
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