Self-healing anticorrosive organic coating based on an encapsulated water reactive silyl ester: Synthesis and proof of concept

Self-healing coatings in anti-corrosion applications

“…SiO 2 or TiO 2 , and then annealed at 500°C. The only capsule materials remaining after annealing are oxides [24,48]. Halloysite nanotubes and boehmite nanoparticles are employed as reservoirs for corrosion-inhibiting compounds [57][58][59].…”

“…Halloysite nanotubes and boehmite nanoparticles are employed as reservoirs for corrosion-inhibiting compounds [57][58][59]. Cerium cations [58,[60][61][62], 8-hydroxyquinoline [48,57], benzotriazole [45,48,49,63,64], mercaptobenzimidazole (MBI) [63], dicyclopentadiene (DCPD), alkoxysilanes [65], silyl ester [24], linseed oil [37,44,66], hexamethylene diisocyanate (HDI) [40], triethanolamine (TEA) [41], monomers and catalysts for ROMP [67], magnesium ions [68], chromium(III) and cerium(IV) oxides [34] and cerium(III) chloride [60,69] are used as corrosion inhibitors. The action mechanisms connected with the particular compounds are presented in Table 1.…”

“…A large number of polymers owe their self-repair properties to the corrosion-inhibiting compounds introduced into the matrix, such as silyl ester (octyldimethylsilyloleate), 8-hydroxyquinoline, calcium(II) and zinc(II)-exchanged pigments, phenylphosphonic acid and sodium benzoate [12,13,[24][25][26].…”

The use of nano-/microlayers, self-healing and slow-release coatings to prevent corrosion and biofouling

“…Self-healing driven by film-forming of an encapsulated liquid is being widely investigated. There are encouraging results on self-healing of epoxy resins on AA2024 alloys by water-reactive silyl ester in urea-formaldehyde shells (García et al, 2011), sol-gel silica coatings on AA2024 alloys by methyl methycrilate in silica gel microcapsules , epoxy resins on carbon steel by epoxy binders in epoxy-amine shells , epoxy resins on carbon steel by linseed oil in ureaformaldehyde shells (Boura et al, 2012), and epoxy resins on carbon steel by tung oil in ureaformaldehyde shells (Samadzadeh et al, 2010). Liquid paints with capsules are also an active area of research, with most of the coatings applied with brush or drawer.…”

“…The most common core substances for self-healing systems are dicyclopentadiene and Grubbs catalysts (White et al, 2001), epoxy resins (Zhao et al, 2012;Liu et al, 2012), diglycidyl ether bisphenol-A based epoxy resins with an imidazole hardener (Rong et al, 2007), mercaptan compounds and cationic initiators BF 3 .OEt 2 , vinyl functionalized poly(dimethylsiloxane) resins and platinum catalysts (Keller et al, 2007), styrene (Wang et al, 2008, Wang et al, 2009, polythiol epoxy hardeners , reactive amines (McIlroy et al, 2010), diisocyanate resins , methyl(methacrylate) . ils draying on air can be used in coatings contacted with air: linseed oil (Selvakumar et al, 2012, Szabó et al, 2011, Boura et al, 2012, Nesterova et al, 2012), tung oil ( Samadzadeh et al, 2011), water-reactive silyl ester (García et al, 2011). Shell materials are polyurethane, amino or phenolic resins, and silica.…”