ADHESION OF EPOXY PAINT AND POLYURETHANE PAINT BY THE PULL-OFF METHOD

Abstract

This article presents the results of testing the adhesion between epoxy coatings, with polyurethane coating and steel substrates by the pull-off method. The paint systems tested for adhesion are: Galvanite No.400 primer (white), Univan MIO (brown), Umerguard HS (grey, red brown), Uny marine HS (grey CS-615), Epicon primer HB (brown), Permax No.3000S (grey, red brown). The measurement method used is the pull-off method to evaluate the adhesion between paint coatings. The results showed that the adhesion of epoxy coating system reached the value of 10.48 MPa. With polyurethane paint system, the adhesion reaches 8.60 MPa. These epoxy and polyurethene coatings systems meet the criterion of adhesion, which is an important criterion for the systems to continue to be included in the accelerated test to evaluate the life of epoxy coating and polyurethane coating according to ISO 12944-6:2018(E). Accelerated testing has shown that the criteria for bilstering, rusting, cracking, flaking and chalking have met the requiements according to ISO 12944-9:2018.