（v16preprint66）Electrochemical behaviour of anticorrosive pigmented epoxy coatings on galvanised steel in natural seawater

摘要

Red iron oxide (RIO), zinc chromate (ZC) and zinc phosphate (ZP) pigmented epoxy resins (ER) were coated on galvanised steel and characterised using potentiodynamic polarisation and electrochemical impedance spectroscopic (EIS) studies in natural seawater. Salt spray test was employed to characterise corrosion performance of coated substrates during different exposure time. Adhesive-strength of the anticorrosive pigmented epoxy coated substrates was evaluated using pull-off and tape tests. The surface morphology of anticorrosive pigmented epoxy coatings on galvanised steel is characterised by scanning electron microscope (SEM). The anticorrosive pigmented epoxy resins viz., ZC, ZP showed the good adhesion strength and corrosion resistance compared to RIO. In addition, the good adhesion was maintained throughout the investigated time period.