Pulsed eddy current signal analysis of ferrous and non-ferrous metals under thermal and corrosion solicitations

In this study, the electrochemical polarization tests were performed on tensioned and non-tensioned CUSTOM 450 specimens in a 3.5 wt% NaCl solution to investigate pitting potential and stable pit initiation time. A potentiodynamic test was conducted to determine the exact amount of pitting potentials. According to the potentiostatic tests, a relation between applied potential and the stable pit initiation time was obtained. Concerning this relation, stable pitting time can be predicted without experimental works. Optical microscopy was used to evaluate the shape of the pits. Tensile stress led the pit to experience the "pit to crack" step. The corrosion rate of samples was studied by the determination of mass loss. Mass loss measurements and current density-time curve in potentiostatic tests demonstrated the rate of pitting corrosion decreased as time passed. Finally, the depth of the pits was measured by the eddy current technique. The results showed that tensile stress facilitated deeper pit development.

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Pitting Corrosion Behavior of CUSTOM 450 Stainless Steel Using Electrochemical Characterization

Pedram

Mollapour

Shayani‐Jam

et al. 2020

Met. Mater. Int.

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Online monitoring of structural materials integrity in process industry for I4.0: A focus on material loss through erosion and corrosion sensing

Meribout

Mekid

Kharoua³

et al. 2021

Measurement

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Finite element simulation study of signal characteristics of pulsed eddy current detection technology

Zhang

2024

J. Phys.: Conf. Ser.

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The principle of pulsed eddy current detection is the phenomenon of electromagnetic induction, and it is difficult to study pulsed eddy current detection technology through theoretical derivation due to the complexity of electromagnetic induction. Finite element analysis uses a mathematical approximation to simulate the real physical system, and at the same time, its use of simple but interacting elements makes it possible to approximate the real system of infinite unknowns through a finite number of unknowns. Finite elements not only have high computational accuracy, but also can adapt to a variety of complex shapes, and can easily deal with the advantages of nonlinear media properties. In the electromagnetic field and other problem-solving, it has a very wide range of applications. Therefore, this paper uses finite element simulation technology to design a pulse eddy current simulation model, using the model to study some parameters of the pulse eddy current detection model. Some conclusions can be obtained after several sets of experiments: (1) Whether the test piece has defects or not, the peak value of the detection voltage decreases with the increase of the inner and outer diameters of the coil. (2) Under the same inner and outer diameters of the coil, the peak value of the detection voltage with defects is smaller than that without defects. (3) The specific frequency of the pulse improves the sensitivity of the detection. (4) The bigger the lift distance between the coils and the measured parts is, the smaller the detection signal is. (5) The deeper the defect is, the lower the detection voltage is.

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Pulsed eddy current signal analysis of ferrous and non-ferrous metals under thermal and corrosion solicitations

Cited by 9 publications

References 12 publications

Pitting Corrosion Behavior of CUSTOM 450 Stainless Steel Using Electrochemical Characterization

Pitting Corrosion Behavior of CUSTOM 450 Stainless Steel Using Electrochemical Characterization

Online monitoring of structural materials integrity in process industry for I4.0: A focus on material loss through erosion and corrosion sensing

Finite element simulation study of signal characteristics of pulsed eddy current detection technology

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