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This research proposes a new electromagnetic non-destructive testing method: the thickness of the coating is characterized by measuring the inductance of the plated part. This method is suitable for the measurement of the thickness of the non-ferromagnetic metal coating on the steel surface. The measurement principle of the new method is the inductance of the plated part is only related to the geometric state and magnetic permeability of the plated part and the environment, and the magnetic permeability of the coating is much smaller than that of the steel substrate. The thicker the coating, the smaller the inductance. At the same time, due to the skin effect, as the frequency of the excitation signal increases, the current is more and more concentrated on the surface where the non-ferromagnetic coating is located. The effect of the coating on the inductance becomes greater, and the inductance will obviously decrease with the increase of the excitation frequency, which must exist the most sensitive frequency of an inductance relative to the thickness of the coating. Choosing this frequency to measure the inductance of the plated part can obtain the best effect of measuring the thickness of the coating.

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Nondestructive Testing of Non-ferromagnetic Metal Coating Thickness on Steel Surface Based on Skin Effect

  • 会议论文

  • 发表日期：

    2025年

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  • Ronghao Zhou,
  • Zizhen Wang,
  • Jun Liu,
  • Rui Zhang,
  • Wei Feng

摘要

This research proposes a new electromagnetic non-destructive testing method: the thickness of the coating is characterized by measuring the inductance of the plated part. This method is suitable for the measurement of the thickness of the non-ferromagnetic metal coating on the steel surface. The measurement principle of the new method is the inductance of the plated part is only related to the geometric state and magnetic permeability of the plated part and the environment, and the magnetic permeability of the coating is much smaller than that of the steel substrate. The thicker the coating, the smaller the inductance. At the same time, due to the skin effect, as the frequency of the excitation signal increases, the current is more and more concentrated on the surface where the non-ferromagnetic coating is located. The effect of the coating on the inductance becomes greater, and the inductance will obviously decrease with the increase of the excitation frequency, which must exist the most sensitive frequency of an inductance relative to the thickness of the coating. Choosing this frequency to measure the inductance of the plated part can obtain the best effect of measuring the thickness of the coating.