Abstract
Adhesive joints are widely used in the construction of modern automotive vehicles. These are not only adhesive joints, but also, connection between coating and steel substrate. The paper presents the results of tests of adhesion of the putty coating to the steel substrate using the ultrasonic method. A reflection coefficient |r| of longitudinal wave was used as a measure of adhesion in the area of the adhesive joint. The tests were performed for joints of car body sheet and a putty coating. In order to obtain different quality adhesive joints, the surface preparation of the steel sample was varied. The obtained results show that it is possible to estimate the adhesion of the adhesive coating to the steel substrate based on ultrasonic measurements. The smaller is the value of the reflection coefficient |r| the greater the mechanical adhesion of the coating to the substrate.
Highlights
Conduct of the studyAdhesive coatings are widely used in the construction of modern machines, including motor vehicles
In the case of ultrasonic tests, a module of reflection coefficient |r| of the longitudinal wave in the area of the adhesive joint is used as a non-destructive measure of adhesion
The main purpose of the research presented in this article is to assess the adhesion of the coating to the substrate for various surface preparation of the car body sheet, based on changes in the reflection coefficient |r| module
Summary
Adhesive coatings are widely used in the construction of modern machines, including motor vehicles. The main factor affecting the durability of connection of the coating with the substrate is the adhesion phenomenon [1]. It is a phenomenon of attracting the particles of two bodies whose outer layers have been joined together. The main purpose of the research presented in this article is to assess the adhesion of the coating to the substrate for various surface preparation of the car body sheet, based on changes in the reflection coefficient |r| module. The tests were carried out on samples prepared from car body sheet, on which a putty coating was applied, which is very often used in the repair of motor vehicle body. The research used a modern ultrasonic flaw detector USM35XS and a transducer that allows point measurements
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