Abstract
Coating steel with enamel results in hard surfaces with high chemical resistance and due to that to good corrosion protection properties. As a result, enamel surfaces are common applications on bathroom and kitchen equipment. Regarding the corrosion potential by additional metal components in bolted joints and the required drilled holes, in the last few years adhesive bonding on glazed surfaces is becoming more common. However, adhesive bonding requires additional adhesive and curing time and therefore, there is a risk of contamination and longer cycle times. In this context, direct additive manufacturing by material extrusion of thermoplastic polyurethane (TPU) applications on enamel is offering new design opportunities and an approach for implementing hybrid structures that combine hard and brittle enamel on one hand with a rubber-elastic joint part on the other. Aminosilane adhesion promoters are able to link TPU and glass or glazed surfaces. (3-Aminopropyl)trimethoxysilane (APTMS) builds self-assembling multilayers on silicon dioxide. Therefore, the effect of wet-chemical coating processes on the adhesion of a TPU structure built on an enamel via additive manufacturing depends on the variable fraction of SiO2 in the enamel. In this research, surfaces with an additional amorphous silicon dioxide coating compared to clean and plasma-pretreated enamel with an additive manufactured TPU application, regarding their influence on interface and adherence of an application on polymerized APTMS coatings built by material extrusion on the enamel coating. The results of pull-off adhesion testing based on ASTM D4541 show an increase of adhesion on enamel surfaces with an additional SiO2-coating and a change of the failure pattern from local failure of cleaned and plasma pretreated to global failure of the SiO2-pretreated surfaces with higher deformation of the thermoplastic elastomer.
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Schneider, H., Dilger, K., Hartwig, S. (2021). Material Extrusion on Enameled Steel Surfaces. In: da Silva, L.F.M., Adams, R.D. (eds) 6th International Conference on Adhesive Bonding 2021. Proceedings in Engineering Mechanics. Springer, Cham. https://doi.org/10.1007/978-3-030-87668-5_5
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