Fabrication of Various Epoxy Coatings for Offshore Applications and Evaluating Their Mechanical Properties and Corrosion Behavior

摘要

This work reports the mechanical properties and corrosion performance of a newly fabricated series ofprotective epoxy coatings for offshore applications. Bisphenol A diglycidyl ether epoxy resin(DGEBA) was treated with different stoichiometry variations of polyamidoamine adducts (ARADUR- PA450) as a curing agent at ambient temperature to fabricate four different formulations of epoxycoatings (DGEBA-PA450). The cured epoxy coatings were applied on glass and steel substrates formechanical and corrosion characterizations, respectively. Mechanical tests were performed for thecoated glass samples using scratch tester, mandrel bend, cross hatch tester, and pendulum hardnessmeasurements. Fourier-transform infrared spectroscopy attenuated total reflectance (FT-IR-ATR) wasemployed to report the composition of the fabricated coatings. The coated steel coupons wereimmersed for 1 h and 7 days in aerated stagnant solutions of 3.5% NaCl and corrosion test wasconducted using electrochemical impedance spectroscopy (EIS) investigations. Collected resultstogether indicated that all fabricated epoxy formulations can be used as protective coatings againstcorrosive marine environments and that due to the high cross-linking of the amino group of thepolyamidoamine adducts ARADUR 450 at ambient temperature.