Molecular-level understanding of the adhesion of the waterborne epoxy coating to the steel substrate

Description

This study was undertaken to deepen the molecular understanding of the adhesion of waterborne epoxy
coatings to steel substrates, addressing a significant challenge that limits their industrial application. The
primary goal was to explore the molecular interactions at the interface of these coatings, focusing particularly
on the potential formation of covalent bonds between the epoxy groups of the coating and the hydroxyl
groups on oxidized layers of the steel surface. These interactions could significantly enhance the durability
and performance of the coatings. Recognized for their reduced environmental impact, waterborne epoxy
coatings were applied to steel panels that had been specially treated to expose and enhance these interfaces
for detailed analysis. X-ray Photoelectron Spectroscopy (XPS) was utilized to investigate the chemical states
and bonding configurations at this interface. The expectation was to identify covalent bonding interactions
that could lead to improved adhesion properties. While the study confirmed the presence of Fe-OH and
potential interactions with epoxy groups, the results suggested that achieving the desired level of covalent
bonding might require additional strategies. Further research could explore different surface treatments and
curing processes to promote stronger and more abundant covalent bonds at the coating-substrate interface.
The insights gained underscore the critical importance of surface preparation and the potential for chemical
modifications in the epoxy formulation to enhance interfacial adhesion.

Period	29 Jun 2025 → 4 Jul 2025
Event title	20th Coatings Science International Conference
Event type	Conference
Location	Noordwijk, NetherlandsShow on map
Degree of Recognition	International