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Determination of the Galvanizing Layers Thickness by Vibration Measurement of Thin Plates | IEEE Conference Publication | IEEE Xplore

Determination of the Galvanizing Layers Thickness by Vibration Measurement of Thin Plates


Abstract:

Corrosion of steel is the partial or total destruction of the material under the action of various environmental factors. In order to prolong the life of these materials,...Show More

Abstract:

Corrosion of steel is the partial or total destruction of the material under the action of various environmental factors. In order to prolong the life of these materials, an anti-corrosion protection is made. The most commonly used processes for this are thermal galvanizing and electro-galvanizing. The galvanized coating offers the treated surfaces a series of physical, chemical or appearance qualities. The thickness of the layer determines the required amount of zinc and is an important component in the total cost of the product. At the same time, the thickness of the layer offers a longer life to surfaces subject to physical wear. In this paper a method based on the excitation of samples by mechanical impulse and the recording of vibration signals with the help of a laser vibrometer is developed and validated. It is a nondestructive and noncontact method. Based on the analysis of the bending vibrations of a sample, before and after coating with zinc, using the Bernoulli equation, a ratio of natural frequencies is determined as a function of the elasticity modules of the two materials, their densities and their geometric dimensions. By measuring the natural frequencies of the samples in such a ratio, the thickness of the zinc layer can be determined. The measurement of natural frequencies is based on Fast Fourier Transform (FFT) analysis of vibration signals obtained by mechanical impulse excitation of samples, before and after galvanizing.
Date of Conference: 17-19 September 2020
Date Added to IEEE Xplore: 08 October 2020
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Conference Location: Subotica, Serbia

References

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