Epoxy coatings are widely applied on steel structures due to their high adhesion strength and corrosion resistant properties. The
transient environmental conditions and photo degradation could limit their long-term performance in many outdoor applications.
The addition of different types of fillers could significantly change their barrier properties. In this study we investigated the corrosion
performance of epoxy coatings on AISI 1040 steel after addition of different inorganic fillers i.e. TiO2, Fe2O3, ZnO and graphite
according to ASTM G-50 and ASTM B-117 standards. The effect of various fillers on the adhesion and degradation behavior of epoxy
coatings after exposure to atmosphere and saline solutions was estimated by visual inspection and Fourier transform infrared
spectroscopy (FTIR). The significant loss in adhesion strength was observed after extended exposure to the ambient conditions.
The notable changes in the intensity of IR signatures belonging to the primary amine, ethyl and origin of carbonyl group could be
related with the degradation of coatings and were in agreement with the loss in adhesion strength. The relatively little change in the
adhesion strength of ZnO containing epoxy coating compared to other fillers suggested its better performance.
Keywords: Epoxy coating; Degradable; Fillers; Salt spray analysis, Corrosion resistance