Adhesion promotion and corrosion prevention using thin anisotropic coatings

Polyurethane/Polysiloxane Ceramer Coatings: Evaluation of Corrosion Protection

“…The results are well consistent with Holmes-Farley and Yanyo's work. [8,10] The difference of corrosion protection between the alkoxysilane-functionalized isocyanurate (2), and TEOS oligomers may be attributed to self-assembly of layered coating as illustrated in Scheme 3 and 4, respectively. Without the TEOS oligomers, the alkoxysilane group of the coupling agent cannot provide sufficient barrier for the aluminium substrate.…”

“…[6][7][8] In the sol-gel process, metal alkoxides as sol-gel precursor produced a condensed film as barrier layer on the metal substrate through the hydrolysis and condensation reaction. Silicon alkoxides are the most used sol-gel precursors, which were used both as corrosion inhibitors and as adhesion promoters.…”

“…The four-functional alkoxysilane, tetraethyl orthosilicate (TEOS), was commonly used and was reported to have better corrosion protection property compared to organofunctional alkoxysilane. [8] TEOS has been applied as a binder in coating formulation for preparing zinc-rich primer. [9] After application, TEOS absorbs water from atmosphere and undergoes hydrolysis and condensation reactions.…”

“…It is a widely used method for corrosion protection. Holmes-Farley and Yanyo [8,10] used TEOS in conjunction with an aminosilane to prevent corrosion on aluminium substrates. In their study, anisotropic coatings were developed using several alkoxysilanes to form multi-layered films.…”

Inorganic/Organic Hybrid Coatings

“…It is also possible that the increase in adhesion may be due to polar-polar interactions as well as hydrogen bonding. In addition, functionalized alkoxysilane monomers have also been used for corrosion protection (69). TEOS was used in conjunction with an aminosilane adhesion promoter.…”