The Reflection Coefficient |r| as a Nondestructive Measure of the Coating Adhesion to a Steel Substrate
Dariusz Ulbrich, Piotr Banas, Jakub Jezierski, Łukasz Warguła
TL;DR
This paper introduces a nondestructive method using the reflection coefficient |r| to measure how well coatings stick to steel substrates.
Contribution
The study demonstrates that ultrasonic reflection coefficient |r| can estimate coating adhesion without damaging the material.
Findings
Glass-beading surface preparation resulted in the best coating adhesion.
Reflection coefficients between 0.61–0.83 corresponded to mechanical adhesion of 1.75–4.56 MPa.
The method allows nondestructive evaluation of coating adhesion based on ultrasonic measurements.
Abstract
The main property of a steel substrate is the adhesion of its coating, which determines the quality and durability of the adhesive joint. The main objective of the research presented in this article is to evaluate the adhesion of coatings to substrates based on ultrasonic measurements and the determined reflection coefficient |r|. An experiment was carried out on disc samples, not only for ultrasonic measurements but also for the evaluation of the mechanical adhesion of coatings to substrates using the pull-off test. Three different methods of surface preparation of the samples were used: glass beading, surface treatment with P400 sandpaper, and the laser beam treatment. Based on the results, it was found that the best adhesion was obtained for samples with surfaces prepared by the glass-beading process. Reflection coefficient values in the range of 0.61–0.83 corresponded to mechanical…
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Taxonomy
TopicsUltrasonics and Acoustic Wave Propagation · Surface Roughness and Optical Measurements · Thermography and Photoacoustic Techniques