Abstract
The paper presents the morphology, topography and corrosion behavior of epoxy resin/zinc hybrid coatings obtained by electrodeposition from zinc sulphate electrolyte. The effect of current density and mean diameter size of polymer particles used for electrodeposition of the epoxy resin/zinc coatings on the morphology, topography and roughness of the surfaces were investigated by Scanning Electron Microscopy and Atomic Force Microscopy. The corrosion behavior of the hybrid coatings in 0.5 M sodium chloride solution was evaluated using electrochemical methods. For microbiological corrosion, the effect of sulphate reducing bacteria (SRB) on the surfaces was evaluated using epifluorescence microscopy. The surface roughness before and after bacteria attachment was evaluated using Atomic force microscopy. Polymer particles provide an influence in restricting the growth of zinc crystals as well as a catalytic role in nucleation sites increase. The results of electrochemical tests indicate a very good corrosion resistance of hybrid coatings comparing with zinc coatings. Epifluorescence images demonstrate that hybrid coating surfaces are slightly attacked by sulphate reducing bacteria.
Highlights
Electrodeposition is an important industrial process used for protection of steel from corrosion
We report the influence of the current density and mean diameter size of epoxy resin particles used for electrodeposition on the morphology, topography and corrosion resistance of epoxy resin/zinc composite coatings obtained in a zinc sulphate electrolyte bath
In current density density and and mean mean diameter diameter size epoxy resin resin particles used for electrodeposition in zinc sulphate electrolyte, on morphology, topography, particles used for electrodeposition in zinc sulphate electrolyte, on morphology, topograroughness and anticorrosion properties of hybrid epoxy resin/zinc coatings onon steel is phy, roughness and anticorrosion properties of hybrid epoxy resin/zinc coatings steel evaluated
Summary
Electrodeposition is an important industrial process used for protection of steel from corrosion. It was reported that new composite coatings were obtained by co-deposition using metal matrix and different particles such as SiO2 , TiO2 , ZrO2 nanoparticles, carbon nanotubes, polytetrafluorethylene (PTFE), polyaniline (PAN), polymethylmethacrylate (PMMA) exhibited improved corrosion properties when compared with conventional zinc [5,6,7,8,9,10]. In these composite coatings, mixed layers of corrosion products from the metal and particles in the composite coating often appear and demonstrate a synergistic interaction which contributes to the improvements in properties of hybrid layers
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