Mechanical Properties and Corrosion Behavior of Different Coatings Fabricated by Diglycidyl Ether of Bisphenol-A Epoxy Resin and Aradur®-3282 Curing Agent

Fabrication of four blend samples of diglycidyl ether of bisphenol-A (DGEBA) epoxy resin cured by physical mixing with Aradur (R)-3282 polyamidoamine adducts (Aradur (R)-PA3282) as a curing agent at ambient temperature has been reported. The thermal degradation, mechanical properties and corrosion behavior of these fabricated DGEBA-PA3282 samples were investigated. Composition of coatings was confirmed using Fourier-transform infrared spectroscopy attenuated total reflectance (FT-IR-ATR). Scratch tester, mandrel bend, cross hatch tester, and pendulum hardness measurements were employed to report the mechanical properties of the different coatings. Corrosion tests were carried out for coated steel coupons after their immersion in 3.5 wt.% sodium chloride solutions for 1 h and 7 days. All fabricated coatings have excellent thermal and mechanical properties. Electrochemical impedance spectroscopy measurements indicated that the different DGEBA-PA3282 epoxy samples can be employed as protective coatings against corrosion in the freely aerated 3.5 w.% NaCl solutions.