Facile Fabrication of Dual Functional Graphene Oxide Microcapsules Carrying Corrosion Inhibitor and Encapsulating Self-Healing Agent

Abstract

Dual functional graphene oxide (GO) microcapsules were fabricated through self-assembly in Pickering emulsions, carrying corrosion inhibitor benzotriazole (BTA) on the microcapsule shells and encapsulating a self-healing agent epoxy monomer. The formation of the GO microcapsules was assisted by the interaction between BTA and GO, which provided robust encapsulation for the epoxy monomer. The loading capacity of BTA and epoxy monomer reached 90.5%. The addition of the GO microcapsules simultaneously promoted the corrosion protection and self-healing properties of the waterborne epoxy composite coatings. The healing efficiency of the composite coatings reached over 99.7% when the content of the microcapsules was 10 wt%. Meanwhile, the corrosion current density of the intact coatings was decreased for around 50 times.

Amino-Modified Graphene Oxide from Kish Graphite for Enhancing Corrosion Resistance of Waterborne Epoxy Coatings

“…To meet the challenge of metal corrosion and the goal of low volatile organic compound (VOC) emissions [ 1 , 2 ], it is an urgent need to develop environmentally friendly anti-corrosion measures that can offer superior protection in heavy-duty anticorrosive coatings. Waterborne epoxy (WEP) coatings are distinguished by their superior adhesion, minimal curing shrinkage, impressive mechanical properties, and negligible VOC emissions [ 3 , 4 ]. However, during the curing process of WEP, micro-porosity and micro-cracking can be formed because of the volatilization of solvent water, thus significantly affecting the barrier properties and reducing the life of the coatings when compared to organic epoxy coatings [ 5 ].…”

Cold-Sprayed Composite Metal-Fluoropolymer Coatings for Alloy Protection against Corrosion and Wear

“…However, the most rational, effective, and inexpensive method of protection is the application of coatings [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. It is possible to use a paintwork material [13,19,30] (including those with additives of nanoparticles [25,[31][32][33][34][35][36][37][38] and inhibitors [13,14,20,[39][40][41][42][43][44][45][46][47]) and zinc coating to protect the material against its intensive destruction [48]. There is also a plasma electrolytic oxidation (PEO) method that allows one to create dense heterooxide coatings on valve metals (for example, Al, Mg, Ti, Nb, etc.)…”

Preparation of two‐component micro‐encapsulated epoxy self‐healing materials based on Pickering emulsion method

“…BN could play a synergistic role in the repair process. The Pickering emulsion template method had great potential in the preparation of self‐healing microencapsulated materials 25–30 …”

“…The Pickering emulsion template method had great potential in the preparation of self-healing microencapsulated materials. [25][26][27][28][29][30] In this study, GO was amphiphilic, because GO surface contained a large number of hydroxyl, carboxyl and other oxygen-containing functional groups and sp 2 hybrid layers structure, meanwhile, BN was hydrophobic, because BN was composed of sp 2 hybrid layers and arranged in a honeycomb pattern, so GO and BN could be used to stabilize Pickering emulsion. 24,[31][32][33][34] A schematic diagram of the synthesis of two microcapsules was shown in Figure 1a, where TEPA and IPDI were polymerized at the oil-water interface to form a PU shell, then the epoxy microcapsules and microcapsules of amines were prepared.…”