Abstract
Epoxy is extensively used for anti-corrosion coatings on metallic materials. Conventional epoxy coatings have a permanent crosslink network that is unable to repair itself when cracks and damages occur on the coating layer. This study aims to develop self-healing epoxy vitrimer/carbon nanotube (CNTs) nanocomposite for coating. Two bio-based curing agents viz., cashew nut shell liquid (CNSL) and citric acid (CA) were employed to create covalent adaptable networks. The 0–0.5 wt% CNTs were also incorporated into epoxy/CNSL/CA matrix (V-CNT0-0.5). Based on the results of our study, thermomechanical properties of V-CNT nanocomposites increased with increasing CNTs content. The bond exchange reaction of esterification was thermally activated by near infrared (NIR) light. The V-CNT0.5 showed the highest self-healing efficiency in Shore D hardness of 97.34%. The corrosion resistance of coated steel with V-CNT0 and V-CNT0.5 were observed after immersing the samples in 3.5 wt% NaCl for 7 days. The corrosion rate of coated steel with V-CNT0.5 decreased from 9.53 × 102 MPY to 3.12 × 10–5 MPY whereas an increase in protection efficiency of 99.99% was observed. By taking advantages of the superior self-healing and anti-corrosion properties, V-CNT0.5 could prove to be a desirable organic anti-corrosion coating material.
Highlights
Nowadays, organic coatings are widely used in various industries to prevent corrosion of metal surfaces
This study aims to develop self-healing epoxy vitrimer/carbon nanotube (CNTs) nanocomposite for coating
The C=O stretching of citric acid and anacardic acid appeared at 1650 cm-1 [16,27]
Summary
Organic coatings are widely used in various industries to prevent corrosion of metal surfaces. Epoxy is one of organic coating materials used in industry because of its effectiveness and ease of application [4,5]. Defects such as cracks and pores of epoxy coatings during application may result in direct contact between the metal surface and the prevailing aggressive environment leading to corrosion [6]. Jouyandeh et al [11] studied organic coatings based on epoxy vitrimer nanocomposites containing modified cellulose with halloysite nanotubes (HNT-C). The epoxy containing 0.3 wt% HNT-C showed a good self-healing behavior with an approximately 56% increase in tensile strength compared to neat epoxy
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