Passivation layer thickness of various metal substrates and their interaction with epoxy varnishes
Sprache des Vortragstitels:
Englisch
Original Tagungtitel:
Polymer Meeeting 14
Sprache des Tagungstitel:
Englisch
Original Kurzfassung:
Bonding of metal surfaces with adhesives is heavily influenced by the base-acid interaction
between the coating and the metal surface. The isoelectric point of metal oxides, which
describes if the surface acts more acidic or basic, varies vastly for different metal oxides.For that reason, sheets of different pure metals were commercially purchased,
characterized and coated with epoxy-based varnishes. With dynamic mechanical analysis
we could show that the glass transition temperature of the epoxy-based coating is
dependent on the metal substrates. Furthermore, the metal surfaces were characterized by
X-ray photoelectron spectroscopy (XPS). Beside the detection of impurities on the surfaces,
the individual thicknesses of the different metal oxides were determined by evaluating the
ratio between the metal and metal oxide photoelectron peaks. To access the interface of the
metal oxide reacted with the epoxy-based coating cryo ultra-low angle microtomy (cryoULAM) is introduced in order to investigate the uncovered layer with XPS.