The Effect of the Addition of Alumina Nanoparticles and Curing Conditions on the Anticorrosion Properties of Polyester Electrostatic Coatings

In this study, corrosion properties of polyester coatings which were fabricated by electrostatic method was studied. Electrostatic spraying is a usuall (or common) method to apply powder coatings on steel parts. In this study, %10 & %20 weight nanoalumina-polyester nanocomposite and pure polyester powder were coated on carbon steel surfaces. To ensure good dispersion of alumina nanoparticles within the polymer matrix, the nanocomposite powder was seen by field emission electron microscopy (FE-SEM). Morphology and structure of coatings were investigated by Scanning Electron Microscopy (SEM). By Immersion test, Tafel polarization and electrochemical impedance spectroscopy (EIS), the corrosion properties of coatings were investigated. Corrosion test results showed that the corrosion resistance coatings by %10 weight Nanoalumina is increased about 30 times. Nanocomposite containing %20 wt Nanoalumina had weaker behavior compared to containing %10 wt Nanoalumina.