Influence of climatic ageing on acrylic coatings adhesion
DOI:
https://doi.org/10.24136/atest.2018.124Keywords:
acrylic coating, climatic aging, aging agents, coating adhesionAbstract
Investigations were carried out of climatic ageing influence on acrylic coatings adhesion to the steel substrate. Obtained results showed that ageing factors action for two years contributed to the decrease of coatings adhesion to steel substrate. Pull-off adhesion strength (examined according to PN-EN ISO 4624:2016-05) was 8 MPa in the case of unaged coating whereas, in the case of coating aged climatically, decreased to 4,3 MPa. Evaluation of unaged coating state after pull-off test revealed adhesive break between the bond layer and the acrylic coating surface on the whole area of the stamp surface. However, in the case of the climatically aged coating, the cohesive break occurred in the primer layer on the 95% area of stamp surface and the cohesive break between the bond layer and the coating surface on the 5% area of the stamp surface.
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