ANALYSIS OF THE PROPAGATION PROCESS OF ULTRASONIC WAVES IN A POLYMER COATING ON A METAL PLATE

Abstract

The paper analyzed and obtained dependencies for the modules of the complex coefficients of transmission and reflection of ultrasonic waves from a two-layer material - a polymer coating on a metal plate. The possibility of using ultrasonic waves to determine the thickness of the polymer coating on a thin metal plate is considered. The use of informative parameters of the waves to control the thickness of the polymer coating will allow to quickly determine the specified parameter in the process of applying the film to the metal plate. This will improve the technological process of applying a polymer coating to a metal base.

Today, in many industries, a polymer coating of thin metal products is used to protect the metal base from negative environmental factors that can affect the integrity of the material and destroy it. At the same time, measurement of the thickness of the coating can be carried out by contact and destructive methods, which makes operational control during the technological process of applying a polymer coating on a metal base impossible. This, in turn, means that the quality of such a coating will depend on the given technical parameters of the technological equipment for applying a polymer coating on a metal base without the ability to control and regulate the current value of the application thickness. Therefore, it is necessary to analyze and investigate the possibility of using new methods and means of measuring the thickness of a polymer coating on a metal base to ensure operational control of this parameter in production.

In order to quickly determine the thickness of the polymer coating, it is necessary to take into account that the ultrasonic signal passing through the two-layer material is a superposition of signals. Without a coating, most of the ultrasonic waves pass through the thin metal plate, in which case the total attenuation of the ultrasonic signal will be less than the attenuation of ultrasonic waves in such a material with a polymer coating. Based on the above, it is necessary to determine how different the amplitude of the ultrasonic signal that passed or reflected from the controlled coating material on the metal plate and the material without such coating is different.