Effect of surface modified WO₃ nanoparticle on the epoxy coatings for the adhesive and anticorrosion properties of mild steel

Abstract

The effect of introducing WO 3 (tungsten oxide) nanoparticle in the epoxy coating was analyzed by electrochemical impedance spectroscopy and scanning electrochemical microscopy (SECM) methods in 3.5% NaCl. The (3-glycidyloxypropyl)trimethoxysilane was treated with the nanoparticle for the proper dispersion and chemical interaction of nanoparticle with the epoxy resin. The introduction of WO 3 nanoparticle in the epoxy coating enhances the charge transfer resistance (R ct ) as well as the film resistance (R f ). The observation of iron dissolution and oxygen consumption was done by applying the appropriate SECM tip potential in the WO 3 -modified nanocomposite coated steel. The epoxy and epoxy-WO 3 nanocomposite-coated samples were used to study the adhesion and anticorrosion properties. The analysis by SEM/EDX displayed that the enriched W was detected in the nanocomposite coating of steel. The presence of the nano level corrosion product containing W was confirmed by focused ion beam-transmission electron microscope analysis. The high corrosion protection properties of the epoxy-based nanocomposite coating was due to the complex nanoscale layer formed and chemical interactions of epoxy resin with surface-modified nanoparticle in nanocomposites. Preparation of the MaterialsMid steel with composition in mass % is 0.1C, 0.2Si, 0.5Mn, 0.025P, 0.002S, 0.045Al, 0.005N, 0.004O, and rest is Fe. Silicon carbide papers with 800, 1000, and 1200 grit were used for abrading the metal sample. Then, the sample was coated after rinsing with distilled water and acetone. Bisphenol A and the aliphatic amine as hardener were purchased from Sigma-Aldrich. The average particle size of tungsten oxide nanoparticles is 50 nm and was obtained Additional Supporting Information may be found in the online version of this article.

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