Abstract
In this study, a self-healing epoxy coating was prepared by incorporating a dual capsule healing system including epoxy resin and its amine-based curing agent. The emulsion electrospray technique was used for encapsulating the healing agents in poly(styrene co-acrylonitrile) (SAN) as shell material. Characterizing the prepared microcapsules (MCs) by Scanning Electron Microscopy (SEM) revealed their spherical morphology with the particle size of 827 nm and 749 nm for epoxy and amine cores, respectively. Fourier Transform Infrared Spectroscopy (FT-IR) and thermogravimetric analysis (TGA) results confirmed successful encapsulation with no side chemical reaction between the encapsulated core and shell materials. The effects of embedding MCs on the physical and mechanical properties of the epoxy coating matrix were studied by pull-off adhesion, conical mandrel bending, and gloss tests. In addition, the prepared coatings’ self-healing performance was evaluated by Electrochemical Impedance Spectroscopy (EIS) and potentiodynamic polarization (Tafel) experiments. The results revealed that the coating sample containing 1 wt% of core-shell MCs (a mixture of epoxy and amine-containing MCs with a 50 : 50 weight ratio) showed the best corrosion performance with 99% self-healing efficiency.
Highlights
Corrosion of metals is regarded as an important and challenging issue in many industries
Fourier Transform Infrared Spectroscopy (FT-IR) analysis was used to characterize the chemical structure of prepared capsules and making sure that there is no reaction between the shell and core during the encapsulation process
As shown in this image, for neat shell material, the absorbance peak at 2235 cm-1 is related to C ≡ N in SAN, and the peaks at 3040 cm-1 and 2930 cm-1 are attributed to the stretching
Summary
Corrosion of metals is regarded as an important and challenging issue in many industries. Capsule based self-healing polymeric coatings utilize controlled release of active agents upon crack formation These active healing agents are surrounded by shell capsules and added to the polymeric matrix. Ataei et al [30] employed electrospray method for the preparation of core-shell capsules containing epoxy resin and its thiol-based curing agent as a dual component healing system for the development of a selfhealing epoxy-based coating. The electrospray was the method to develop a dual capsule self-healing system based on epoxy resin and amine-based curing agents For this purpose, epoxy resin and amine-based curing agents were separately encapsulated by SAN shell and subsequently incorporated in an epoxy matrix to prepare a dual-component self-healing anticorrosion coating. Considering the fast reaction between the epoxy resin and the amine group in curing agents at room temperature without any more required additional catalyst, the prepared system offers high healing efficiency at room temperature
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