Novel Thiol-Ene Hybrid Coating for Metal Protection

Abstract

A novel hybrid anticorrosion coating with dual network of inorganic (Si-O-Si) and organic bonds (C-S-C) was prepared on metal through an in situ sol-gel and thiol-ene click reaction. This novel interfacial thin film coating incorporates (3-mercaptopropyl) trimethoxysilane (MPTS) and 1,4-di(vinylimidazolium) butane bisbromide based polymerizable ionic liquid (PIL) to form a thiol-ene based photo-polymerized film, which on subsequent sol-gel reaction forms a thin hybrid interfacial layer on metal surface. On top of this PIL hybrid film, a self-assembled nanophase particle (SNAP) coating was employed to prepare a multilayer thin film coating for better corrosion protection and barrier performance. The novel PIL hybrid film was characterised for structure and properties using Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). The corrosion protection performance of the multilayer coating was examined using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results reveal that this novel double layer coating on metal offers excellent protection against corrosion and has remarkably improved the barrier effect of the coating.

Kinetic Model under Light-Limited Condition for Photoinitiated Thiol–Ene Coupling Reactions

“…The reaction between an alkene, or an alkyne, and a thiol is widely accepted as having the properties of a click reaction . It has become a powerful tool in various synthetic methodologies, biofunctionalization, surface and polymer modification, and polymerization. − This thiol–ene click reaction can follow two different mechanisms depending on the type of initiator that is used . The base-catalyzed thiol–ene (also called thiol-Michael addition) reaction is initiated by adding a nucleophile, usually phosphines. , Or the reaction is initiated by exposing the thiols to heat or UV light, which generate thiyl radicals that will react with the alkene, or alkyne (Figure A). − …”

Effect of Surface Pretreatment on Quality and Electrochemical Corrosion Properties of Manganese Phosphate on S355J2 HSLA Steel

“…The PD curves were obtained at ambient temperature using an applied potential from −250 mV to +250 mV vs. open circuit potential with a constant voltage step 1 mV•s −1 as used by Taghavikish et al [19]. Measured potentiodynamic curves were analyzed using Tafel fit by EC-Lab software (software financed by the project ITMS 26220220183).…”

Polymeric Ionic Liquid Nanoparticle Emulsions as a Corrosion Inhibitor in Anticorrosion Coatings

“…The SNAP coating was prepared by the method proposed by Donley et al 17 Mild steel substrates (CA3SN-G, 0.08% carbon contents, thickness ∼ 0.6 mm, 1.7 cm × 1.7 cm) were cleaned using a process reported by our group. 18 The coating solutions with a total volume of 20 mL were prepared by diluting 7 mL of SNAP solution with DDW by a factor of 1.75. In order to find an optimized concentration of the PIL nanoparticle emulsion, three different concentrations (0.4, 0.8, and 1.6 wt %) of the emulsion were added to the SNAP solution followed by the addition of surfactant (3M FC-4432, 0.04 % w/v).…”

“…Coatings were prepared using SNAP as a matrix for coating and for the addition of different concentrations of the emulsion to improve the barrier and protective properties of the SNAP coating. The SNAP coating was prepared by the method proposed by Donley et al Mild steel substrates (CA3SN-G, 0.08% carbon contents, thickness ∼ 0.6 mm, 1.7 cm × 1.7 cm) were cleaned using a process reported by our group . The coating solutions with a total volume of 20 mL were prepared by diluting 7 mL of SNAP solution with DDW by a factor of 1.75.…”