Acquired self-healing ability of an epoxy coating through microcapsules having linseed oil and its alkyd

Abstract

Abstract In the present study, microcapsules (MCs) having either linseed oil (LO) or its alkyd (LO-Alkyd) have been incorporated into an epoxy matrix to produce self-healing coating. The epoxy film itself has a Yellowness Index (YI) of 2.81, while LO and LO-Alkyd MCs loaded epoxy films have YI 44.87 and 21.98, respectively. Their SEM micrographs reveal that capsule embedding do not disturb the continuity of the film thanks to the successful interfacial capsule-epoxy adhering. LO and LO-Alkyd MCs incorporation reduced the strength of adhesion of the epoxy coating to the metal surface up to 34% and 39%, respectively. The water vapor permeability of epoxy film increased 8% and decreased 43%, by addition of LO and LO-Alkyd MCs, respectively. Electrochemical Impedance Spectroscopy revealed that the impedance of the films increased by the addition of capsules into the epoxy. Electrochemical Impedance Spectroscopy revealed that the impedance of the films increased by the addition of capsules into the epoxy.